Where would I be able to find a new, antique-style shofar with a soft mouthpiece?*
When I say antique-style, I mean something like the one below which belonged to my Litvisch great-grandfather.
Or this one rescued from the Shoah:
Both of these shofrot have been reformed by heating the horns and slightly flattening them, then carvings executed at the end and sometimes throughout the length.
*the hardness of a mouthpiece refers to the amount of difficulty involved in blowing it, at least with woodwinds (shofrot have brass-type mouthpieces, but I'm using the language I'm familiar with).