External BTCPay server + umbrel for lightning?

It most certainly does not.
Unfortunately it only accepts HTTP or HTTPS, which, since we’re behind TOR, won’t work:

I even tried setting it in the format they want. No go.

The only way to do this is going to be with a reverse proxy. I’m trying to adapt this tutorial, but not having any luck b/c I don’t know what to do with nginx. Last time I tried to install it, it screwed everything up.