Hi Jeffski.
I have a North Water skirt (with laces) and ran into the same issue.
I attached a GoPro mount to one end of a 3"x0.5"x24" pine board. I then drilled a pair of holes near each end of the board. This allows me to tie the board across the gunnels of the skirted canoe, near the bow or stern, using the lacing of the skirt as tie-in points. This provides a low profile camera perspective that so far has survived my many whitewater wipe outs. GoPro mounts are more fragile, however. For this reason I also attach the camera to the lacing with a short loop of rope (100 lb test) so that if the mount breaks, I will not lose my camera. This has happened a couple of times (!) and it works.
I have a couple of videos that were taken using this method of mounting.
https://www.youtube.com/watch?v=69mQkYNLtFghttps://www.youtube.com/watch?v=8seHU-xOy9c