Okay, I've given this some more thought, and it's most practical to just use the chancellor's report for now.
As more sites are added to the registry (and consequently to the report), the potential for using the report as a means of identifying webmasters goes up. In that respect, we don't need anything extra right now. Updating once a month is "live" enough for my purposes.
Looking ahead, though, I imagine that the progress reports will eventually be discontinued. When that happens, I may ask for something new to list webmasters. Or maybe by that time everybody will have webmaster contact information on their sites.