Flagging something is probably the way to go in that situation, as that will identify the trolls in a much more targeted way.
Going through accounts who joined the conversation around the time of the CoC changes as a worst case could lead to the deletion of accounts that were made by the LGBTQ+ community in order to not out themselves on their main account, or, if instead barriers are put in place for accounts in this time, it’ll massively effectaffect a part of the community that needs to be listened to at this point, so that we can deescalatede-escalate.
Either way, it would just make relationships on the site deteriorate further, imoin my opinion.