This is not really suited for StackOveflow; but the suggestion I would make is to take the parts of your code that are subject to audit; write them as a Python C module which is then imported. You can ship the compiled module along with your normal, unmodified django application.
This would only work if certain parts of your code are subject to this audit/restriction and not the entire application.
Your only other recourse is to host it yourself and provide your own audit/controls on the source.