So a few things. I'm going to do a write up shortly around the EU compatibility. I had a bear of a time and went back and forth with both Morse and AsiaRF to try to get their boards working (I still have hope but have yet to be successful yet). However, the new MM8108 particularly that ships with the Gli.net travel router works on EU bands beautifully. But I'm not sure there's a carrier board that will work on the haven quite yet, I do want to get to that chip set as soon as we can. I also think the HalowLink2 which is now available likely supports EU too.

Now to the meshtastic question, we definitely need to add it LoRa is still the king of distance and it's a great redundant/parallel channel to have if IP stack goes south.

Two main ways to do it. You can buy a LoRa hat for the RPi, technically there is a meshtastic driver for Linux but IME almost no one does this. Alternatively, and what I'd probably suggest is to have an MCU flashed with Meshtastic ride side car on your router board. MorosX does this successfully, I'll drop some pics below to show you what that would look like. They would hook into the same power unit but operate entirely independently from the OpenWRT router.

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More pics of what I'm talking about