If not, I was thinking of putting something similar up. For the time being, it only works with proper BIND (dynamic) updates with key pairs. I'm doing it under *.d.defsol.com at the moment, but we could obviously register anything for this purpose :-)
The four DNS servers handling this are located in Sweden, London, Frankfurt and Amsterdam.
Well, the offer is there in case anyone needs it. I will cross-post this to a few places.