Unique Way to Promote Your Superhero Book

If you are a publisher of Superhero Fiction, here is a unique way to get some free publicity, and without having to do or give up anything.
I am working on my second Superhero Book. In the book, some superheroes are looking for new members. What if one or more of your characters made a cameo appearance there? I would happily give you a blurb in my book. Likewise, I would appreciate you mentioning the appearance to your fans.
I would let you have final approval over anything your character does before publication.
I think it would be fun for the readers to open up the universes a little.

bigontraining@yahoo.com