I think a Alpha Pioneer DC plus would be ideal. Has 6 point mounting, fixed clamps, linear gripper, and a dropweight. Tension should be accurate since its a constant pull rather than a crank tensioner. How come you are not going to use the Gamma? It looks like a very good machine. Otherwise, goodluck on searching for a stringer.
Racquet : TGK238.1 2X / Head YTPP 1X
Strings : BHB7 17G 49lb / LUX 4g Rough 17G