Wow! Thanks for this thread. I got a deskmini 310 with 32GB RAM, i7-9700, 1TB nvme and 2 x 2TB FireCuda HDs. I have an intel AX200 WIFI card, but this didn' work, so I left it out and used a ASUS BT-400 BT-Dongle, which works fine for BT. WIFI might get added later.
My deskmini is on the latest FW 4.40. I have another MacBook Pro from 2012, so I did the 1TB nvme in a external case, installed Catalina there and replaced the EFI with those from the first Post on this thread, replaced whatevergreen, lilu, AppleALC with there latest versions.
I put also a 512GB microSD card inside the reader on the motherboard, but it didn't get recognised?
Then I build in the catalina-nvme in my deskmini. Worked from the start including iMessages.
Only thing which didn't work is the APPLE App-Store, regardless how often I try to log in with my Apple ID credentials, it didn't work. Maybe someone can help with this. Do I really need an Apple-blessed WIFI-Card for this to work?
Any recommendations for me? Should I go OpenCore even if Clover works fine?
Thanks again for all who contributed to this thread.