I need 32bit apps, so I've stuck with Mojave so far... but I felt daring today, so I created a new APFS volume, downloaded the Catalina 10.15.1 installer, and began the installation from Mojave. Starting with all the latest and greatest goodies (Lilu, WEG, Clover, etc) stashed in the right places, everything went smoothly. After the install was finished, I just copied over my /L/E additions from Mojave, ran kext utility, and viola!
There is one tiny thing that I can't figure out. HWmonitorSMC2 (v2.4.9) doesn't display some of my stats... specifically, CPU utilization and anything related to graphics. I'm using the latest version of VirtualSMC (1.0.9), and all the kexts are installed to CLOVER/kexts/other (not 10.14).
Any ideas on what I should check? To confirm, all my stats are there when I boot into Mojave (with the same Clover + config I use to boot Catalina.)