First thing I thought of when I read OP;
https://images.app.goo.gl/oPNCJLeejgVSjLiT6
The 207 & 208 jazztone are just a tiny bit bigger than a 351, and fairly thick, maybe 1.8-2mm so it feels substantial between the fingers. Molly Tuttle uses a 207 so they can sound pretty darn good. If you are in the continental USA, pm me your address and I’ll send you a 207 if you like.