After butchering the bottom of the C-7 Caribou, I went with plan A and drilled a hole in the back to accommodate a peg. The nail I used turned out to be a little smaller than the depth of the hole, so the nose still sticks up a little. The nail is temporary. I hope to find a clear acrylic rod of the same diameter and use that.
I'll attach a rare earth magnet to the bottom of the plan before priming and painting.