I am just beginning to prone foil also, looking for something when there's no wind and the surf is crap. I would describe myself as an average surfer and below average winger.

I originally surfed mals and are now riding short boards due to now surfing beach breaks from point breaks originally . I got the Naish 7' Hover board to learn to prone which does paddle well like a Mal
FWIW some random initial observations
Agree with Mid Atlantic find a spot with waves getting mushy on an outer bank then coming into a gutter for some depth away from everyone
The difference between the longboard pop up is you tend to have your weight back so it doesn't nose dive and to turn. The pop up for foiling you need to have weight forward plus you have to land centred in the right spot.
Remembering you are riding the foil not the board My tendency is to land with my weight tending toe side ready to turn so have made a note to work on my short board pop ups
My wing board is flat across the bottom so I don't think it would paddle very well as a prone as the Hover has bevels etc but give it a go . I think you ideally want a board which will hold relatively normal prior to the pop up and foil
I did try and SUP my original board once again I am used to longboard style SUPs so it was a pain
Time on the water is key