Content switching with SSL offloading on a single virtual server address

That isn't possible really, you can't control the browser directly.

Regarding the iRule, it should work just fine but you'll probably find all the links returned by the server don't include what you want shown. That being the case you'll probably need to expand the iRule to accomodate all the possible paths that the server might return or use a Stream profile to rewrite the links in the server responses.