Nope, I am at least pretty sure only the majors for now get their own tanks and companies. Most minors will just get generic companies for each branch of the military. However, I do believe all vehicles and companies are treated as being indigenous. If you are Bhutan, and you start manufacturing tanks (don't question why or how, just bear with me), all those tanks produced are YOUR tanks that YOUR scientists designed and YOUR workers built (you have just built a Bhutani Purple Salamander Tank). Judging from this, I assume that you could just give your Hungarian or Czech tanks historic names since you can name vehicle models. After all, even great power tanks, are pretty much just cosmetic, and I would assume you would be able to get them modded too.
Though I do hate the black silhouettes. They should just fill the silhouettes with their respective tanks (since all the silhouettes are of actual vehicles).