Ok so I've thrown together a python tool that you can use to retrieve a list of instances you federate with and then save the domain name, title description of the instance, and the version its running on to a sqlite database. you can then convert that to a csv file and use that to filter out out of date instances and upload it to your server as a block list.
I just threw it together this afternoon so its very crude.
right now its a very slow process for it to run through the list and save the info and I'm sure there is a better and faster way to make it work but im limited in my python skills.