The Burn FST models came with a plastic insert that you could slip over the pallet which was supposed to make it easier and more comfortable to hit a "modern" 2hbh. Supposedly the current gen Blade models offer the same technology but now you can 3d print the insert into different shapes. I don't think it's what you're looking for, but here's a link.
A poster did design/created some pallets. Was a fail as the material used made the pallets way too heavy and brittle. Injection molding uses a different plastic composition.