I already called them this morning.
In case anyone else tries to do something like this or gets stuck on it:
They had me make an all new blog with their Manage WordPress host (rather than using my existing WordPress.com site), including creating a whole new username, password and everything. After that I imported my XML from my old blog, retaining my posts and other data. I was given a temporary URL for the moment, but they talked me through the process of transferring my domain to them, rather than keeping it on WordPress.com. My domain will be able to become active again after the five-seven day waiting period. I can now access the dashboard for the new site and can install plugins and such even while I have the temporary URL.
