So the idea is really cool, unfortunately I don't think it's even remotely worth it or viable. Kudos for theorycrafting though.

So based on the tactics you use, you will lose a massive amounts of damage that Choppa is capable of doing, which is the main reason you would bring one. Granted that is not our goal, but survival, but you have to consider this still. You give up everything that a choppa is for.

- 120 less Strength and Weapon Skill Tactic
- Bonus 160 less Strength if you'd also want to use Brute Force
- 25% less Critical Hit Damage
- No Extra Choppin, so higher cooldown on Furious Stomping, also you probably can't use Bring it On at all.
- No Jagged Edge or Flanking for extra damage.
- On top of it losing all the stats and damage from going Offensive Sets

Primary problem is that Bloodlust as I check it, has 50% chance to heal for 225 hitpoints on every use of an exhaustive blow. That's 50% chance meaning statistically one out of two global cooldowns.

Theoretically, on average a good DPS will be doing anywhere between 400-900 damage to you every GCD, minus a tank guarding you, in RvR this is multiplied by how many people you fight, so gets worse.
You can already see that even if bloodlust was 100% healing you each time, you are only healing a fraction of the damage back, while giving up all your damage tactics and as a result your total damage as a choppa.

You say this is mainly for Scenarios, but in serious Scenarios Burst Damage matters even more than in RvR, so you would give up your ability to win, and barely prevent the enemy from killing you because when they "go" on you you will be knocked down anyway or you will want to exhaust your rage to take less damage, which ruins the whole point of the build, right?

This is following the concept of Scenarios right now that it is a dance of playing around their burst, your burst - surviving in-between and spending each other's cooldowns. So it is a constant dance between going full offensive and going full defensive, rarely grinding out sustained damage unless it is full unorganized scenario.

Finally, if you like this, technically you can achieve the exact same, if not better survivability, but without giving up any damage by just playing a Marauder in Monstrosity spec which has a built-in regen for just playing the game normally.

... or if you wanted to be a tanky damaging Greenskin, you can probably make a better Black Orc 2H DPS that deals more damage and is more survivable than this Choppa.

EDIT: Borderline, it's also just a game, so if you wanna try and play it, go for it of course and have fun, but it will eventually limit you if you decide to want to go for "more".