QuickLisp solves most of the issues. Quiop and closer-mop if you want a universal CLOS.
Scheme is not Common Lisp, it's kinda the opposite. It comes with batteries included and MCClim is the defacto GUI for it.
>Stuck with Emacs [from the URL]
Well, Lem tries to be Emacs for Common Lisp, but without having to think on two Lisp languages (albeit closely related) at once.
Once you have a REPL, autocomplete and some docstring looking up tool, you are god.