During Battle for Zendikar prerelease yesterday I played my first "real cards" MTG tournament since GP Vienna around 2003-ish. Now I learned that there is now a DCI website where you can look up your tournament results, Planeswalker points, etc. Apparently, it is this one: https://accounts.wizards.com
Now I am wondering how to actually create an account there using my existing (8-digit) DCI number from way back. Using Create Account won't do, as it seems to create a new, unchangeable, DCI number. Using Activate DCI number functionality does not do what I want, since my number is from long before activation codes were a thing.
I have considered contacting support, but based on previous interactions I was hoping that there is an easier solution.