Greg,
What did you use to glue the sheeting onto the foam cores? Epoxy Hopefully!
If you have done a good job at fitting your wing skins as it looks you have, matched up LE & TE, then filled your wing sheeting in places where needed, there shouldn't be a problem with the dope over the sheeted foam wing.
3 coats of 50/50 clear Dope and put down the carbon. If you have any reservations about the clear and a reaction on the foam core, then dust on the first coat.
All my previous Magnums have had silkspan & dope finishes without any problems.
$kote should be a last resort, I would think!
Mike Clark