Are you taking 61as, the self-paced version? I was under the impression they were either already using, or planning to switch to, a JavaScript Scheme implementation to ease just this sort of problem.

I know one of he people who is running 61as, and I believe he wants to move as much as possible into the browser. In fact, they might even use a JavaScript-based Emacs clone instead of Emacs proper next time.

I think using the browser should make setting up the environment much easier than using some old, unsupported Scheme implementation!