Knowing some of these movements, Vostok didn't move far with much of its movements as its a kinda "if it works don't fix it" outlook so I imagine the 2431 isn't going to be much different from its predecessors, maybe look to the 2416 is it auto for ideas on the automatic works but Vostok followed convention and I was quite surprised how disassembling one of my 1940's Boctok's how similar it is to a 2234 or 2209.
There is an American on youtube called Ratfacedgit or Ratfaced_git who has delved into quite a lot of Russian movements. I would also ask Vostok direct if you can contact them if they have a dealer's schematic or workbook you could download, I did this with one of my higher end Miyota powered watches and the chap there sent me a few pdf's on how to do just about everything on that watch so you could be lucky.
Whenever I get stuttering on my 2414 movements, I pull the little "elbow" off and give it just a little more pressure and the stutter goes.
It sounds like a recent watch, is it not covered still by warranty?
Vostok does do quartz ones, seen a few Cardi, Century Time with quartz suspecting the ubiquitous Miyota 2115 that seems to live in so many quartz pieces.
Thank you for your invaluable suggestions. Guess, this is going to be the assignment for this weekend.