ca hinges should be easy enough to cut so that should work, you can also cut your flaps so they have a hinge close to the end so you don't have to mess with that, and you will only have to seal the flaps. It is not hard to seal the hinge gap, just deflect the control surface to the max, and with a 3/4" strip of covering iron it on. Hinge gaps should be sealed anyway, or so I have been told. Lately when I seal a hinge line I do not seal at the hinge and it makes for a much neater job, but either way with a little practice it is fairly easy to do.
Calvi