I think it would work adequately with the arm on the opposite site of the servo body. Isn't there a photo of this setup in the manual?

If it doesn't, then move into the 21st century and get a computer radio. In my (biased) opinion, anyone who is flying 3D should have a computer, if only to play with the mixes and flap/spoilerons.

Leonard

PS Really it should fly fine with the geometry reversed. A computer is just easier and more versatile.