Update:
Greetings.
I removed the previously set Guest VM encryption.
I was able to convert the Windows 10 x64 VM disk to UEFI following the beforementioned advice (linked in thread origin). I then shut down the VM guest. *No snapshot created.
I created a new VM Guest and selected the UEFI w/secure boot option in the wizard. Then took ownership of the previous guest VM VMDK(s).
The OS boots fine. I then encrypted the VM guest and add TPM. Success.
I still have no options for VBS or UEFI secure boot in the VM's adv settings (Picture shows what should be there but for me the options are not available). Could this be a bug in Fusion 12.2 @ Monterey OS?