I feel stupid, but I have spent the last hour looking for a plugin I know I have seen in the past, but I cannot remember it’s name. It allowed users to update user fields without going to settings / profile, but to do it directly in a post.
Do you know which one I mean? Sorry. 
This?
It’s not a plugin as you can see but I cannot for the life of me recall seeing a plugin that does that. I’ll stand corrected if someone does find it.
Then I also get to feel silly 
Thanks for the reply, but no, this is not that one. 
This was specifically to update the user custom fields. But this is going to be interesting if we find it. I have given up for today.
Woho! Found it
Thats a nifty theme component! Bookmarked as it may come in handy 