Neat! I set up something very similar a few years ago (just with raw dnsmasq); fun to see someone else hit upon the same solution.[0] For anyone running a similar setup: if you want to keep everything as-is, but also expose a single service to the Internet, you can use Tails ale's "Funnel" feature.[1] I use it to self-host Plausible on my home server (i.e. to allow hits to my blog to be counted by my home server, even though that server isn't "generally" available on the Internet).

[0]: https://simpsonian.ca/blog/securing-home-network-dnsmasq-tai...

[1]: https://simpsonian.ca/blog/selfhosting-plausible/