1.  Use Third Party Creative.  Pretty much create your own "custom" Creative.  The downside to this is that you have to host the image yourself.

2.  Roadblocking.  Use Single Request Mode and create a Roadblock for 2 Ad Units.  This way you basically have 2 that show together, the Sponsored/More Info (Third Party Creative of text and link) and the actual Ad (Image Creative).

3.  Javascript is very possible.  What you would do is basically wrap a div with an ID on the sponsored text and one around the More Info.  You then have a Third Party Creative that executes to replace the contents of those divs with what you want and display the ad.  Like #1, you'll need to host the image yourself or do something similar to #2 (1 Ad to switch text and another to show Ad).