Transposing for playback only, score remains unaltered

I am transcribing some classical guitar scores originally for lute. Typically, this involves changing the pitch of the third string on the guitar from G to F# and placing a Capo on the third fret of the guitar to raise the pitch. These instructions are made on the score as a reminder to the performer. Thus far, I have been unable to figure out how to transpose the score a minor third higher for playback only. I don't want to alter either the score key signature or the actual notes, only the playback pitch. Is this feature currently available or is this a new feature request? Transposing a score on the fly using a capo is a desired skill for a classical guitar player, and eliminates "messy" key signatures with double sharps and flats... It would be useful if MuseScore could note the indicated instructions and perform the playback transposition automatically!

Thank you!