You are aware that you can still buy a new (!) Mac Mini 2018 with Intel processor and install macOS 10.14. It’s a bit of a hassle to do the downgrade but it is possible and works wonderfully.
Well aware, I shouldn't have to plan an entire system around one device however. Access needs to get of their f***king asses and sort this out or declare it incompatible/EOL so I can decide whether or not to keep these things around.