Sorry I forgot to mention, I actually did get the Player 16.2.1 up and running under Alma Linux 8.5.
After install of 16.2.1 (failed with the vmmon/vmnet). I tried a crap-shot with compiling the modules from mkubeceks github above.
You will get an error in the C-file crosspage.c / line 53 missing the frame.h file. So instead of the <linux/frame.h> I grabed the <asm/frame.h>. I had no time to investigate, but at least everything runs this way. Be careful ! This is a total crap-shot !