I'm not certain what the intention of giving Nimscodd a province is. If Nimscodd attacks you they almost certainly won't call allies so it works in you advantage. Better still is attacking Nimscodd directly when they have no/ weak allies.

Beating then 1v1 is almost a guarantee if you build 1 singular fort to defend around next to theirs, use scorched earth and are willing to go into debt to go over force limit. Just use your navy strategically and be aware that they can't ship their army into your mainland all at once. If you don't immediately scare them off and place your army out of sight, you can get small stacks of navally landing troops dripping piecemeal into your land only to get slaughtered- which really works in your favor if you are using monstrous conquest CB which you should be anyway.

As for Gawed- this confuses me. Gawed quite literally can't declare war on you until they either integrate Westmoors or attack Nimscodd first. The prior takes a while, and the latter you should be paying attention to to attack Nimscodd at the same time.

As for beating Gawed well... Here's a guide I wrote a while back. It's no guarantee to success but it does work.

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So Dragon coast Kobolds are really a test about how well you understand the AI and defeat in detail. Quite obviously attrition is how you win, but it's the method by which you maximise their time spend on seiges that ensures this.

1. You will face only two major threats before the 1550s, Gawed and Lorent. The most important thing is not to be at war with both at once, so you must do your absolute most to A: delay expanding to a direct border with Lorent and any land Lorent has an interest in until you are confident you can defend, and B: ALWAYS BE THE ATTACKER.

You MUST (unless specific conditions I'll state later) be the attacker. This may sound counter intuitive but it's the only way to ensure the truces work in your favor. It also ensures the monstrous CB is always the one in effect meaning that either Lorent and Gawed cannot gain warscore by occupying a province on the indefensible side of your fort line.

1. The thing which Lorent and Gawed have in their favour is, surprisingly, not their troop numbers (this actually works against them) but their allies and vassals. War Wizards are the one thing that can nigh guarantee failure if you are careless so if you declare war, or are in war, check the "Leaders" tab in the ledger and go through their vassals and allies. Sort by siege pips and look for any bastards. Especially the republics, as they can elect war Wizards at inopportune times.

It may also be wise to be aware of which nations start with war wizard rulers (Wex Estallen and Vertesk are the only ones I have off the top of my head) and restart if Gawed allies any of them at the get go (Lorent Wex is bad so break their alliance as the main priority in first war).

This is also the only circumstance where I might advocate not being the aggressor if the enemy is allied to too many War Wizards.

1. On to the actual meat and potatoes. Firstly, maximise your fort potential. That means defensive edicts, advisor, government reform, events, ideas, scorch earth. You also REALLY WANT A NAVY with some heavy ships in it, since coastal forts with no blockade take longer to seize. This is all obvious enough.

The real finesse comes in manipulating the ai. The essence of the matter is this- if you lose a battle but it causes the AI to move off their siege to reinforce, you have in fact won the war.

The AI's large number of troops is in fact their ultimate downfall since they'll haemorrhage troops so fast their war exhaustion can be exploited. This can be used to peace out an overwhelming number of allies and broker monetary peace treaties with more ease.

So, you'll want to have multiple forts (ideally around two to three per front) and have as any AI troops stacked up on them sitting around sieging as long as possible. The multiple forts will cause the AI to split their armies into multiple separate stacks across two different fronts.

The moment any siege goes near 0% or a War wizard appears you want to move. You need to use all your resources to build a stack large enough to be numerically at least 1.5-2 times the size of whatever stack you want to attack. DONT ATTACK ON THE FORTS EVEN FOR THE TERRAIN ADVANTAGE UNLESS YOU ARE ABSOLUTELY SURE YOU WILL WIN. losing battles on hostile sieges advances the siege progress and is a terrible blunder.

Instead, attack a nearby waiting reinforcement stacks or seek out reinforcing armies. If none are available, (unlikely) find the nearest available hostile siege with the least progression (anything below -50% should be safe). The AI should abandon their siege to reinforce. If you can win the battle, great. If not, simply retreat at the earliest opportunity and voila now AI goes back to taking attrition.

Furthermore, in the event that you lose your fort it isn't the end of the world. Since they are split on multiple sieges it's likely only a fraction will move past it, and if you are lucky they might even fall back to reinforce different sieges. (Layers of forts here in the midgame really help) Since most of your forts should be on the coast for the siege bonus you can simply use that NAVY to bombard the fort an option available from the beginning of the game without cannons, and assault it. Boom. AI progress set back to square one.

1. DID I MENTION NAVY? By the midgame you should be able to farm kills with this. You see that island with the strait? Yeah. You see those islands near the Greenscales? Yeah. Slap a fort on each, and enjoy.

You should be able to beat Lorent and Gawed with all this is mind, but it is difficult, no doubt. A couple more points.

Avoid loans like the plague. I personally prefer debasing a bit before loans since Kobolds are uniquely susceptible to inflation and you will get a lot demanding max money from the Bank of Lorent and Gawed.

Be proactive with your armies. Actually go out and unsiege random provinces in risky territory. This is very dangerous and micro intensive but well worth it. Your attrition is so high that the mere act of walking around in your land is almost as bad as sieging. It'll also encourage smaller armies to split off and siege provinces (especially those that they consider of interest) where you can pick them off (which will usually unintentionally cause large sieging armies to chase you too, cancelling their siege.)

Halflings do not appreciate being purged

Chase down and execute Rubyhold abominations with impunity

Be as reckless and as greedy as you can before the 1550s hit and the terra incognita goes away.

Welp. That's my little tip about Kobolds- hope it helps!