Maybe these two thread do help you, i couldn't understand exactly what you want.
Custom forwarder channels for games
[Guide] Mighty Channels...Play WiiWare from SD or USB
I only know of wii savegamemanager (see app pack of the softmod any wii guide)
or look into nand emulation with sneek/uneek, have in mind you can run the whole wii off emulated nand, with memory as big as your hdd.