Back in the day there was the Off The Front Grip Shape , I got several sets in 89 ~90 and used them under the tape..

they're out of business Now, By From the looks of them you can make your own..

Get a U shaped Wood Gouge to gouge out a depression in a 2by 4 clamped in a vise

wax it as a Mold release , then Pour in Plastidip . the tool handle stuff, and let it Cure

pop out that one and do it again.

I liked the broad flattish shape ,, of the finished project.

My roadie bike got A Fizik Gel Pad and tape job over the winter.. they're still Round..