The "Y" will work fine, or you can set the wing type as flaperon per info on pages 39 through 41 of the manual. You can always take the manual to the field with you and have your friend help with the final setup.

Even though I have never used the flaperon function as flaps, I prefer having the ailerons on two channels. Two 6" extensions coming out of the receiver is cheaper than one "Y" so I save a few dollars here and there. Those few dollars eventually pay for a gallon of fuel.