I spotted this offer of getting a couple of boards made up for free:
I lack the skills or time, but it occurred to be it might be fun to get them to bolt their E5 module to the opensource Esp32:
I know this was something Disaster Radio looked at: https://twitter.com/disastrradio/status/1250175471410712587
Might be worth starting from their Gerber? disaster-radio/hardware/board_esp32/GERBER at master · sudomesh/disaster-radio · GitHub
But adding the E5 module instead of the second ESP32.
No idea if it would actually work, but if Seed started making them it might make a nice repeater node & really help with scaling large networks.