I was also a fan of AUI.
Unfortunately the scan situation has always been minimal (as far as I can remember at least). David Ward (ex deputy editor) put some issues online at
Issuu, and a bunch more can be found at
archive.org but that's all.
It would be great to see a complete set someday, but it didn't have the popularity of Amiga Format, CU Amiga, Amiga Power, etc. so that might be a tough ask.