Jack - You do seem to be deliberately playing the pedant.
Of course with any chromatic instrument, you can play a full range of notes within the even tempered scale.
Of course you can learn to play the same note as a piano whilst reading dots written to play with a band tuned to an open scale in B flat, but to what real purpose?
If a composer writes music for a clarinet and piano, they do not write it that way, they take into account the difference between the instruments and write parts with different key signatures.
Quack!
GtD.