No fix, that is on par with the other External Authentication 'accounts' (groups). The pain is more pronounced here because most of these OAuth rely on individual accounts and not groups.
Taylor, I was going to mention this at our session today here in Dallas but thought I'd hold it until we talk about security next month. I haven't actually tried to do this and failed, but yes, it occurred to me that this probably wasn't possible.
And yes, it hurts, because I've enjoy using my utility database to create and edit user accounts in all my solutions.