Additionally, consider that the increased lift is to help achieve a smooth but tight turn (the old unattainable 5' radius turn) and would impose a tremendous stress on the wingtips which could (would?) make the wings break and fold in flight.

I think there is a reason why the guys who are much more knowledgeable than me put them close to the center if using partial flaps.

Another consideration is that flap tweaking is a means of adjustment. It may be a bit harder (more sensitive) if done at the ends.

I would not recommend it, but if you give it a try, let us know your findings. Good luck.

George