On the Matrix side, we've put a lot of effort into being good neighbours, fwiw - e.g. recently this massive refactor at https://github.com/matrix-org/matrix-appservice-irc/pull/166... to allow the matrix<->irc bridge to be restarted without reconnecting all its IRC users (the single biggest complaint we ever had about the bridge in terms of eroding usability of IRC for IRC natives).
Sadly it looks like it wasn't considered sufficient, based on https://libera.chat/news/matrix-deportalling.