all options would please modders I presume:
tribal -> castle already exist.
tribal -> city already exist.
it lack:
tribal -> temple
castle -> tribal
castle -> city
castle -> temple
city -> tribal
city -> castle
city -> temple
temple -> tribal
temple -> castle
temple -> city
Or just make a command that sets the type of a barony to whatever you want: castle/city/temple/tribal
Well given the way the decisions are set up currently, I'd assume that convert_to_feudal & convert_to_republic would work on holding types other than tribal. However, I haven't tried it yet so I can't say for sure.