My method of ripping Wii games with Friidump & burning with Imgburn (DVD-R & Dual-layers) worked fine.
This method doesn't copy/rip the boot/security part of original Wii games (clearly visible on disc). So, you're left with a non-bootable Wii game. The hard-mod/s bypassed that directly.
But, if you can dump/rip the same Wii games with the above method, & then convert them into WBFS files, & put on your USB devices & they will work (no boot sectors). All without the bootable security part (yeah - I know). The DVD roms in question can still read them (the non-bootable rips). It's clearly audible.
I haven't got around in trying to run Wii game back-ups directly from a GDR81XX & using GX or any other apps. I always simply thought that apps (GX & the like) would just simply boot/start it without any issues. Looks like I was wrong

I did overlook the fact that the DVD-R backup is still as ISO (without boot-record). Perhaps once the Wii game rips are converted to WBFS files, & then re-converted back to ISO & burned, it may work better (another DVD boot sectors returned ???) ? I really need to try this for myself. Time, work & sanity is killing me
ULoader seems old but still functional (for the some/most of it). But then the read speeds are snail paced, & the changing of under-ware after ULoader starts loudly
One for the coders - Would it hard to update ULoader ?
Many would say "No". Inserting/changing discs is/was tedious. USB storage wins.
I have my original Wii games, plus 2 sets of backed-up copies. Just sitting there, slowly deteriorating