There are t-hole stocks, and Cali legal available...if that answers your question.
I live in a crappy state.
No thumbhole, no muzzle device, 10 round mags, no pistol grip.
The saiga sporter pictured in my post above is pretty much what I'd like to put together.
Without a muzzle device of any kind.
The main issue is that saiga uses a trigger group that moves the trigger back far enough to be reachable using the Monte Carlo buttstock. Without that, you simply can't grip the rifle and use the trigger unless you have 7 inch fingers.