While it would make a great fan made custom, an official toy of Liokaiser would need to have a bit more effort put into it before I open my wallet.
Hellbat and Guyhawk would work in both robot & vehicle mode, but their combiner modes wouldn't be right.
Drillhorn and Killbison probably could get away with all 3 modes.
Leozak & Jaruga would need to be new though.