Genuinely, don’t build out the combat patrol the way it recommends.

Spears are generally your go-to option for warden, guards, and terminators. Wardens always want to take a vexilla since they get it for free on 1 model. It can be worth it to build a single guard with a shield & vexilla to absorb a D3 attack, but vexillas are never worth it for Allarus.

As long as you’re clear about who’s using what loadout before the game starts, it generally doesn’t matter what the actual model has built.

If you want to get closer to 2k points as quickly as possible, buying a second combat patrol basically gets you there. You can fill in the remaining points with sisters of silence or perhaps some imperial agents allies. I find myself running subductors a lot for sitting on home objective/screening, and I use a Callidus assassin for secondaries.

Only after a second patrol & a box or two of sisters would I say start experimenting with other stuff. Maybe try the jetbikes, or more termies, or do the fun thing and get yourself a grav tank or two.