I came up with an alternative idea, but I need someone to tell me if its stupid: how about using hockey tape for a custom grip, creating a pinky and index rest from a conduit hanger (some have used a sawed off BD Ice Clipper), and then instead of taping everything with electrical tape - use spray rubber to coat everything. It will take a few coats. I've used spray rubber on my wrenches at home and it works great.
Unleash your fury.
Derek