Option 1: Email Can You Brew It and request them
The more people ask the better the chance they'll get around to it.
Option 2: Brew one of Jamil's ESB recipes from his book or The Jamil Show. See what it tastes like, ask for feedback here on how to get it closer to what you want it to taste like.
I have submitted for CYBI and I have a decent ESB recipe. Rogue's version is an Imperial and my attempts to "boost" a regular ESB to Imperial strength have not really been close.
I would encourage everyone interested to email Jamil and see if we can get XS Younger Special Bitters on the show.