As a musician myself I am also quite protective about my hands but also a daily emacs user. The biggest ergonomic improvement you can make on a standard keyboard is to remap your control key to be command (most regular emacs users I know do this). At work I use a Kenesis Advantage keyboard which allows me to use my thumbs as modifiers which is even more comfortable.

To answer your question, if you are not looking for particular LISP I would checkout Racket as I think that has a non-emacs IDE.