Late reply here, but no, unfortunately I still have not. I’ve shelved this issue to work on more pressing things, hoping something comes up by the time I get back to it.
Anecdotally, I did figure out how to pull avatars from my friends’ list, but that same method didn’t work across non-friend accounts. There must be a way to do this, because Tekken 7 does it, but I’m not sure if it’s possible using the Advanced Sessions BP plugin or not.