Have you thought about doing a sniper conversion with one of the Super Vepr's? I've got a Super Vepr that had similar work done to my rifle. I've got one of the older units with the different scope mount that keeps the scope closer to the barrel. There is still enough room for the scope to quick detach with low Molot 30mm rings and 50mm objective.
Another thing to think about is putting a recoil reducer in the A2 butt stock tube since it's wasted space anyway.