I really like the Whython suggestion :) Phil Hassey is currently working on a small python derivative called tinypy. It's so recent I don't think he's gotten a project page up for it, so you'd need to backtrack through his blog posts for an overview. But as he's just done a _lot_ of what you're about to do, it would make a great basis for prototyping your ideas.
Hope this helps. -alex23 -- http://mail.python.org/mailman/listinfo/python-list
