I mean, yes, this cable works with direwolf, but then I need to have a full linux system running, which I could do without for the purpose of an emergency comms system.
I just found https://github.com/cheponis/KISS-TNC2, but I think this is just the KISS mode, not the AX25 stuff.
I found https://www.ir3ip.net/iw3fqg/doc/wa8ded.htm which I think describes the TNC2S software I was running many years ago.
Any other pointers would be great.
Of course, trying not to giggle at the 28 year old who thinks they need 4 meetings a day for their precious startup is a different matter. But as long as they pay on time...