At this point it is somewhat difficult NOT to order SBus servos as Futaba's selection gets pretty limited in non SBus digital servos. The answer is yes Bob I have ordered a slew of them S3470SV's as the general servo and S3071HV's for the flaps. It will require some creative installation work for the ailerons, but nothing I can't handle. My concern is the flaps as the 3071 servos while not too expensive are a tad less powerful than the JR DS8411's spec'd by SebArt for the flaps. Though I'd say they will likely be fine. If I replace the 8411's with the 3071's which does allow the removal of the decoders in favor of 'Multi 'Y" connections, then I can move from 6.1V on a regulator to 7.4V on this system, now so the torque spec on the flap servos is then well within boundaries too. Sorry Bob long winded answer, but yes the decoders are only required for non-SBus servos.
Len