Ptarmigan Dick,

You said "Mind you, it's not hard to play in F on a standard Treble or Tenor/Treble anyway".

Precisely! it only takes a little re-mapping of ones mind and the tenor treble is perfect for it. A baritone-treble better still since if used in F by playing as if in C but one buttonstep lower you will still have the habitual tenortreble range intact for the low notes.

For those who don't know it may be worth mentioning that if you want to play more permanently transposing to the key of F you can easily convert your instrument for it by changing places for all B and Bb reeds and replacing all D#s with C#s (or just play an imaginary G# - sounding C# - when the actual music asks you to play Ab (which should be sounding as the non existing Db you want to replace by that said C#)
Easy as pancake !?!
Guran