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i did this with a Wii once since i had a bricked unit) might also save a bit more if you go for a machine with a broken disc drive and then open up one of yours to replace the disc drive. you can even replace the body with one of yours if the replacement's shell is too beaten up. Seems like the only way to fix this would be a hardmod but at that point buing a cheap console would be more viable (Wii U consoles with no cables or accesories are cheap. I was going to suggest using the disc update of a Wii U game to restore the system but i don't think that'd work if you can't reach the main menu.

i also separately made backups of my important saves since there's hombrew apps that let you do manual backups of individual games.

i also have backups of the whole system and all important files. My launch Wii U has had homebrew in it for a while now (just regular Haxchi, no coldboot since it feels risky and regular only loses you like 10 seconds per boot) and i've messed a bit with it and never had a problem. maybe consider buying some lottery tickets, you could hit it big probably. both the glitch in the first Wii U and that system transfer glitch together seem like a 1 in a million thing.
