You might try chain saw gloves. The ones you want aren't much bigger than regular cycling gloves. They have really good gel inserts that do a great job isolating the hands. I get mine at the shop that sells and repairs chain saws, not at the local box store.

Also, you might try some focused physical exercises. Lots or really small muscles in the hands and feet that have voices all out of proportion to their size. Once you get the mucslces built up it won't matter what handle bar or whatever else you use.