Tailscale maybe?
They have a mode where you can configure a site to site links, you could route the docker networks.
https://tailscale.com/kb/1019/subnets
In case you haven't seen it already - 3mdeb shared some info on the state of things during last FOSDEM. If I'm not mistaken they also did an update the year before too.
I know of exactly 1 AMD corebooot laptop.
Starlabs Starfighter.
For coreboot you're basically on Intel.
As others mentioned, look up dasharo. They have added support for two modern MSI motherboards and Intel cpu models.
For the project as a whole, it is not free. You are FORBIDDEN to distribute the apk compiled by you (including modified, e.g., rename app name "Shizuku" to something else) to any store (IBNLT Google Play Store, F-Droid, Amazon Appstore etc.).
+1 for Organic Maps. Create an open streetmap account and contribute - its a game changer for me. Instead of a consumer, you're a contributor. (That goes for all OSM ofc)
Tailscale maybe? They have a mode where you can configure a site to site links, you could route the docker networks. https://tailscale.com/kb/1019/subnets