Ultimate Jets Sells an "ASSI" device that is exactly what you are looking for. It uses a Pitot tube to set up an auto-throttle. It is made by Corsten Groen in Europe and they work great. I have two of them.
My electronics knowledge is fairly limited, so if I understand it correctly I would need an ASSI gadget and a more modern radio to control air speed instead of engine throttle.
Ivan