If the expectation in that session is that familiar songs are fair game for accompanists, then G# is antisocial. Take it up to A or down to G. It's got such a limited range this can't possibly matter for any singer.

If you have a really individual take on the song which requires it to be unaccompanied by anyone else, that's different. But shutting out participants from what would ordinarily be a participatory art form needs compelling artistic reasons.