@geerlingguy I would also love to try @batadv on a router with both classic 2.4/5(/6)GHz WLAN and with an 900 802.11ah HaLow PCIe (M.2?) module at some point. @batadv's experimental "BATMAN V" algorithm is throughput based (if the WLAN device's driver exports its throughput estimates), so it should be able to prefer the high throughput WLAN bands if available, while automatically using 900MHz as a fallback.
I'm wondering if a #Switchberry could be a great board to try that.