As far as the trigger goes, an original trigger will work with no other changes to the pistol. I had to try some spares I had from years ago to find the best function, but they work well in the two RGuns imports that I have.
I've also used Romanian magazines in mine, and they work quite well. I didn't think they did initially, but I fired both pistols without extra lube with a few hang-ups, and once I applied some Lucas heavy duty everything smoothed out. Both of mine (1954 and 1964) are mis-matched as most of these seem to be. Frame and slide match, but small parts on the 1954 are a random mix. The 1964 frame and slide match, with all else matching another pistol (bushing, barrel, trigger mechanism all match each other).
I'm really happy these are coming in, but hang on to your Yugoslav M57s from Armamentos - those are the best imports I've seen in a while, as far Tokarevs go.