Another thing you can try is to play the song in the other position on the accordion. Many, many songs will work perfectly fine especially if it is just to cover a request. Here is one that I have done several times: Ivy Dugas recorded "The Gravel Road" in Bb on a Bb. Even in Bb, it is a pretty high song. I don't have a Bb, so if someone requests it, I play it in A on a D accordion. There are a few subtle differences in the melody, but you can get your point across.

good idea

i;ve done that

wle.