Thanks for replying and apologies if this is dumb question but
"Some change the SMBIOS to iMac 13,2 instead of 6,1 Mac mini and then the AMD cards work. Give that a try. You can simply change it at the Clover Boot menu to test it. "
Is that JUST changing Product Name field to "iMac13,2" but not changing anything else? I tried "iMac13,2" and "iMac13,2_" so it matched the style of previous entries.
I just tried both and still KPs. The first "iMac13,2" looks identical to my previous pic. The second goes a few lines further adding "apfs_load_inode_internal" entries...
I can't be the first person to use a GPU... should I disable HD4000 in BIOS?