I've been using the table method with Gibberish AES, although I don't compile the tables, I'm not sure the size benefit is that significant.

http://github.com/markpercival/gibberish-aes

The advantage of mine is that it's fully OpenSSL compatible and plenty fast. 20k of text on Chrome take .064 seconds to decode and encode.

But I love the idea of compile on load, might have to steal it :)