Yep, if you have a milled Bulgarian kit you can build it up with a stamped receiver. What you will need is
1- AKM style front trunnion. Romanian, Hungarian, Etc... 23mm
2- Milled profile barrel. Yugo barrels will work, but will need some work. GM makes a replacement barrel for milled profile too-
GM 1970 Barrel
3- A rear trunnion. If you use a milled Bulgarian UF, you will need a Romanian stamped UF rear trunnion. If you wanted a fixed stock you can use a normal AKM rear trunnion.
4- Stamped receiver. Depending on what style rear end you want will determine what receiver you will use.
Other thing to note is that you have to grind the channel in the front trunnion ears where the RSB fits in as milled profile RSB are wider than the channel in an AKM trunnion. No big deal, only takes a few minutes with a file.