I don't know how hard this could be, or if I'm potentially late to the party, but I think we shouldn't be able to include links to someone else's userspace; since it will mostly be used for signature forgery or other bad-faith matters.
Topic on Talk:New requirements for user signatures
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Reply to "Only link to your own userspace"
Only link to your own userspace
I'm sure I have seen people link a signature from their alternate account to their main account. Plus when people change their username all their old signatures still link to their old name. As for signature forgery and other badfaith stuff, if and when that happens our admins can deal with it. No need for a software solution until and unless something becomes such an issue that a software solution is needed.
Agree with WereSpielChequers. Some alternate accounts, such as bots, might be better linked to the main account than to themselves. ~~~~