At least you have a full backup. So you are able to unbrick it with a hard mod and soldering. If you have the skills required to install the hard mod anyway.
To be honest, installing the hard mod to the WiiU motherboard isn't hard at all. Soldering in general isn't hard, if you got the right tools for the job.
Thanks all, for the responses.
Can I use the fake SD Card mod to flash my backed up NAND?
https://www.reboot.ms/forum/threads/guide-emmc-nand-dump-backup-restore.530/
How exactly does one create a flashable image to flash a backedup NAND? I have mlc.bin, otp.bin, seeprom.bin, slc.bin, and slccmtp.bin, and I'm unsure of what or which files are used to recover.
Thanks again for the advice.