Tailscale dev here: yes, you can set up a custom coordination server in the settings, just like on the iOS app. Open the tvOS Settings app, then scroll down to Tailscale.
Genuine question: Does tail scale want people using headscale?
I'm a free-tier personal user, and a little too cheap to give a for-profit corp money when I don't need to just because "I REALLY like the product". If I use headscale does that just cause a headache for the team, or is it good because it reduces traffic to prod?
I'm to cheap to pay when I don't need to, but its such a great product (esp for free) that I'd gladly change how I use the product to be less expensive or problematic.