Ok... a series of steps worked for me (pal version, usb loader from WD hard drive)
i was able to chose the difficulty for each game because i saved a file in each game from a hired disc ($5 guys, come on)
chosen alt. .dol files to load Mp1, Mp2 in config usb loader
chosen alt. .dol files to load Mp3 in Wiiflow usb loader
each usb loader loaded the respective game and save file flawlessly
this might be pain for some to load the games in different loaders, i believe the new version of gx loader works for all three, but this particular loader has always frozen for me