I don't have a problem with there being sparse (or even no) regionals available some places, it's just I'd like some way to see what are potentially there, so I know whether that 5th level MIC will let me get something good so I need a type 4, or if I should settle for 4 and put a type 3 govt in.

A map would be nice but it seems to me it would be simpler if the building tree could show the full range of MICs. Or is that not practical?