As feared, the surplus 7.62 stripper clip guides will not work with the Pmags since they don't have the groove on their sides where the guide locks into. Otherwise, it looks as if the dimensions are a go, though. So I will try to dremmel those lips down untl they will slide onto the pmag. Maybe if I hit it just right it will be loose enough that it will slide on the pmag, but tight enough it will have some retention so you can still use it.
Wish I had a mill.