Thank you for helping me out! I’d actually already seen that library, but sadly, it doesn’t work for our setup. We use Django with Gevent (you can see why here), and that library requires asyncio. 
We ended up building our own library from scratch. Basically, we translated the auth0-fastapi and auth0-server-python libraries to create an opinionated way of handling account linking, connected account flows, and so on. My big concern is that the My Account API is not GA. 
I used to use Token Vault, but it changed so drastically that I had to focus on account linking instead—at least until I found a serious bug in it. Well, there is a specific topic for that.