If all you want to do is deviate from standards on purpose, just change
<html>
to
<apple_ml>
and base64 encode the .html file (for no reason) and call the resulting file .iapp. Done. Standards broken. Proprietary status achieved with minimal effort. Change ".css" to ".bss" if you want to go the extra mile.
and leave everything else as-is? Sounds like a win-win for both developers and biz dev.
and leave everything else as-is? Sounds like a win-win for both developers and biz dev.