That's a good call on the evidence available.
I can see the deeper oil cooler of a late production/conversion aircraft, which fits with the camouflage, and is that a G-10 style supercharger intake? Various other filler caps and intakes all look to be in the right places.
I think that the foremost of three antennae is also just about visible on the opened panel in front of the windscreen. They should be there in a FuG 217 installation.
I'll take Terry's word for 'White 7', it's not one I'm aware of. A W.Nr. would be great, any aircraft like this could have an interesting history.