Correct. Only reason you would ever need WMR would be if you had a WMR Headset like Reverb.
You do not need the force enable VR if you have VR option checked to run in DCS GUI.
You will want to run MT version of DCS executable for sure, it is in the DCS bin-mt folder.
I "think" you probably don't have to have the force open XR nomenclature either as I think the MT version runs by default Open XR but hurts nothing to put it there, I have had it there for a long time.
Make sure you have Open XR toggled on in the Varjo software.
Have fun,