We don't have anything to do with disaster.radio (maybe that should change), but we do have an existing single board computer that runs Linux, has a LoRa radio, and wifi. A somewhat similar product, but we use this for reception of a satellite data broadcast.
https://othernet.is/products/dreamcatcher-v3-05
It has the 2.4 GHz LoRa radio, the SX1281. It also has a wideband mixer and synthesizer, which allows transmission across 85 - 6000 MHz. You should be a ham in order to play with the tx-side. The SX1281 is not compatible with sub-GHz LoRa.