From the windup position with the ball in the glove any movement associated with his delivery of the ball to the batter commits him to the pitch without interruption or alteration. I see a problem in that if that this is HIS "natural" pitching motion any hesitation or variance from that motion could be construed as deceptive and the thrown pitch would be called a ball or a balk with men on base. I also might suggest the pitcher become more conventional because many college coaches incorporate pitching signs that include a "glove wipe" that alters the catcher's signs and with this unorthodox windup it could generate some confusion. ???
Fungo