Couldn't you use the current daemon on a public IP.
Then possibly each TEAM could setup their own update source if they choose to do so.
Each member of the team would only need to add a foldtraj_fileserver.cfg file to their client directory. It would contain an entry like:
http://www.teamproxy.org/dfp
The only problem I see is a corrective action for events similar to what happened the previous update. Wrong clients were set on the main page and the foldtrajupdateproxy grabbed them before they were replaced. When they were replaced, the version numbers were not changed so the proxy didn't grab the newest ones before the update was triggered.
Just a thought!!