sounds good, but you want to add this
http://apps.ycombinator.com/item?id=1304456
and this
http://nedbatchelder.com/blog/200804/wicked_hack_python_bytecode_tracing.html
and this
http://www.perlmonks.org/?node_id=501844
into the mix, and I personally think you're onto a loser with the whole idea to begin with, even without the bs mentioned above. Life needs to simple to be secure, complexity doesn't equal security.