@neilhimself i don't know if you'll get answers for this but i'm really interested in such a solution too.

At least, if there would be a way to tag those conversations in the archive, with who twitter says it is when we open it directly on twitter ><...
We can do that by replying to each convo with the name of the recipient but it means to wake up some old/nasty ghosts, in the process of sending them a new MP ><...