My question too. Why?

Are you thinking flaperons? (Need a computer radio and usually don't do much on a trainer.) Thinking better performance because of direct servos on a "Y" connector? (Won't make enough difference to be worth it.)

Just for the experience of trying it? (Go for it! )

Hitec HS-81's would be powerful enough, and fit in the wing better, by the way.
Dennis-