There are already sandboxed Lua, Python, and Scheme implementations on iOS, and have been for some time. The strict "no interpreters" rule seems to have quietly

There are already sandboxed Lua, Python, and Scheme implementations on iOS, and have been for some time. The strict "no interpreters" rule seems to have quietly fallen by the wayside a while ago, to be replaced by selective enforcement. (Presumably based on something non-obvious, like: does the implementation offer a way to break out of the app sandbox?)