What you propose should be fine. Most model airplane airfoils are straight from the designer's imagination. "Real" airfoils don't behave the same in small scale as they did when being tested in a wind tunnel. Almost any shape that looks like an airfoil ends up working fine.

I normally build up ailerons using 1/32" or 1/16" contest balsa sheet and a whole lot of ribs spaced about 1" apart. It's lighter than aileron stock and much less likely to warp.