Thanks for the info. For myself, I’d rather see ♭ and ♯ in any fallback font than “flat” and “sharp”, but it’s not up to me.
FWIW, the macOS UI font, San Francisco, does not have any Music Unicode glyphs; nor does Times, Helvetica, Lucida Grande, Verdana…
Arial and Times New Roman have a sharp glyph, but it’s crudely drawn; and no flat or natural.
For what it’s worth, I don’t find this to be the case:
Perhaps this was the case in earlier versions of the software, but it looks OK to me in Dorico 4.3.11, running in German.
We have recently been doing some work on instrument naming as part of some work on improving MusicXML import, and in our development builds I no longer find it the case that you will get a player name like Trompete (B Be) by default, to wit:
(The default layout name is the same as the player name in this case.)
So I hope you will find that this specific issue is improved in the next major version of Dorico, when it comes.