I see. That's just what a friend programmer says (I'm a designer) but hey, I'm willing to try and think outside the box
I though that, as the WebView in android has it's own cache and cookies apart from any other app and can be injected with Java objects trough the addJavascriptInterface method, doing this whole thing should be possible. I know there are some security risks, but if the browser gets disconnected I don't see the problem. The thing is that I don't know how to generate this "local runnable content pack" of caché and cookies. And in iOS, well... I suppose the approach has to be a diferent one. I´ll take one thing at a time, if necesary.
But yeah... after all, might be impossible tough XD