Sorry, I don't think blizz included hyperlink embedding into the game. If they had, then I would have seen an example of it a long time ago.
The bnet "ladder ranking" button is the only case I've seen, but this is not hyperlink embedding, its just a simple "click button - open webpage" technique.
btw, I'm not in any way trying to stop you from posting your own solutions to problems, the solution you posted above was completely valid for this problem.
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.