My first thought was replacing Rapid Conscription with the Commissar squad for both commanders, but I had some concerns that those commanders might overshadow NKVD then.
An ability that refunds lost models with manpower would be pretty good already though, considering both commanders have PPSH Conscripts, so I decided to keep Rapid Conscription on both.
I know, but I was literally out of ideas, other Guard doctrines already offer anything you would want to need.
Here's a wild idea though: how about a Red Banner T34/85 Command Tank as a replacement for IL-2 bombs for this commander instead? The tank happens to already be in the game files. Bonusses would have to be determined by the balance team as to keep things balanced.
I would put the commissar in Reserve Tactics (keeping the morale of the reserves up), and For Mother Russia in Conscript Support Doctrine (making cons truly the centerpiece of this doctrine).
As for Soviet Combined Arms i would rework it. Since it's theme is combined arms i will include mechanized infantry, tanks, air power, artillery, anti tank and anti air weaponry. I would rework it like this.
Combined Arms Tactics
M4C Sherman 0CP
It has nice anti-tank capabilities and it has vet that supports the combined arms idea. Also i would like to see it im more then 1 commander considering how much the soviets used them in real life and just to add more variety to the game.
Tank Hunter Ambush Tactics 2CP
Combined Arms in WW2 stresses the proper usage of anti tank weapons i feel that this would be nicely represented in this ability. Like you idea it would combine with Anti Tank Gun Camouflage.
M5 Halftrack Assault Group 3CP
Again mechanized infantry is a key player in WW2 combined arms warfare. After the fix where the Assault guards can be build normally from tier 3 this ability should cover both the infantry, mechanized infantry and anti air needs nicely
ML20 8CP
A howitzer is here for obvious reasons. Again i think howitzers should be tweaked.
IL2 Strumovik Strafe 10CP
Yes you heard me right, the Advanced Warfare one. I think that after the fix a cheap plane ability would be perfect for this commander. IL Bombing runs can also be a bit much combined with the howitzer.