Well this is useful... not.

Evidently my username has been removed from the list of Metalink users associated with my previous project. Nothing wrong in that, I fully understand why that was done. Problem is, though, that because I have no active Support Identifiers in my profile, I can't access any part of Metalink aside from my own profile!

Anyone out there got a workaround to this?

Hmm tricky one, because nobody else can amend your profile for you (other than metalink admin peeps).
I also dont think you can randomly add in support identifiers because it sends an approval email to the admin list associated with a given CSI.

If you are desperate to access some content then i could (at a push) do the equivalent of leaving my terminal logged in for you to use