I don't think automatic conversion to Unif would be possible, unless it's done with a nestoy/goodnes-style database. Info for north american board-types are out there, but it poses a problem with accurately documenting the multitude of Japanese cartridge-types. To avoid emulation SNAFUs, the UNIF info would probably need to be verified as being accurate before becoming widely distributed.
That'd be a project in itself. It's gotta start somewhere, though.