You'd need to do a bit of work to adjust the timing, I suspect. At 530km the time delay would be around 1.75ms which would be enough to greatly upset WiFi ;-)
You could probably talk between ends using cheap crappy 446MHz 250mW walkie-talkies though.
You could just send raw 802.11 data frames and then receive them with monitor mode on the other end.
This data base could be used to optimally place meshtastic nodes.