Sounds like fun. I’ve been looking for more info on updating UUID/MAC/SN on non-Asus boards because I want to be able to do this myself.
So far, found two methods that use the UEFITool from LongSoft
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Find the exact body in the bios containing the UUID/MAC/SN. Then extract and replace the matching body in the new/clean bios file.
How to transplant MSI motherboard's UUID\SN\MAC from programmer backuped BIOS to new BIOS ? -
Same as above, but replacing the entire volume
hp DMI fixed in Bios files before using it to flash the bios chip using Hxd & UEFITool - YouTube