Facebook vanity URL problem!

I have a bit of a problem, I registered my website name for a Facebook fanpage and built up the required 20 fans in order to secure a vanity URL. I knew that someone else was using the same user name (even though I own the dotcom) but I wanted to register the username so that people could find the page easily if they did a search. I thought it was possible to choose your vanity URL if it wasn't available as per your username? It seems that this is not the case with Fan pages though. FB say that is will be possible to assign vanity URL's "in the future" but this could mean anything. Does anyone have any info on when this is likely to be? It was a real pain to secure 20 fans from my list because I am in the middle of a major rebrand behind the scenes and don't want to let the cat out of the bag... so is my only option to contact all of these fans with an apology and a fresh link to a whole new page that will have an available vanity URL?
I'm pretty pissed about this because it looks like even though I can register my profile as my brand I can't actually get a vanity URL to go with it (eg Profile name: MyBrand Vanity URL facebook.com/mybrandusers). If I have to register another tweaked version in order to secure a vanity URL well that is going to make the page harder to find and will probably affect the SEO (a huge headache will be involved in trying to work the new vURL into the overall brand and marketing campaign). Anyone else out there experience this and manage a work around? Am I missing something very basic?