RE: Flaps or flaperons?
No disagreement with what any additions can do. There are many ways to add breaking and a lower pitch prop is one of them. There are several types including a broad props in a 14". But the need to have this to handle an already slower model with any of these measures is the meaning of my comment re relevance.
I could understand if this were a jet with a low AR high wing load but it isn't. So the need for breaking...... Still if its just for fun, heck my old Kadet I had flapperons on it, it was 2 lbs over weight and I actually did land it on the top of a picknic table.