W10 appeared on my update today.
Made a clone and installed 2020/2004. Went ok except at 92 percent where it sat for 15 minutes or so. I used System Mechanic to defrag the memory a few times and it started moving again after a couple of minutes. Now sure if the defrag worked it or not. There are two 3.5 frame installs after the major install is completed.
Restarted several times and only had one minor issue that was resolved with draining the power. The W10 feels a bit more snappy and to my biggest surprise I gained 22GB of disk space after running Disk Clean Up. I'm not missing anything (documents that I can find) and everything works - printer, monitors, sound, chrome browsers, SSD still has over provisioning, etc.
Easiest Windows install for me in a long time. Glad I didn't force install it.