If you can identify the IP ranges you can configure anon https://github.com/edsu/anon to listen for edits from them, and announce them using a particular Twitter account.

Honestly, I just put anon together in a few hours, and didn't put a great deal of thought into it. It might make sense to do what you suggest, and create a more generic webapp to deploy on Wikimedia labs, which manages the IP ranges, and Twitter accounts to post to.