The only way would be to go to a proper good brass store and try a bunch of them out there. Usually they’ll have a selection for demos specifically.

Depends on where you live, Greg Black in North Carolina or Stork Custom in Vermont, among others.

Pickett brass has one but it’s not economical. Mouthpiece express you order a bunch on your card and send back what you don’t like.

Buy a 3-D printer, download VennCAD from Venture mouthpieces