how to connect UUCP nodes in the 21st century?

Hi all,

one thing that fascinates me about UUCP is it's decentralized
ad-hoc, peer to peer nature. With modems and analog phone
lines being a thing of the past, what are viable options to
connect uucp nodes directly in the 21st century and what are
their requirements?

 - UUCP over IP (obviously requires IP connectivity)
 - GSM Network? (is anyone using this?)
 - Ham Radio? (pretty sure UUCP over Ham is a thing)
 - exchanging USB sticks or similar media (good ol' sneaker net)
 - null modem cables (only local connections)

The last three options would be independent of intermediate
infrastructure. Though the UUCP over IP option whould of course
work in an ad hoc mesh wireless network.

Are there other options? Any experience with any of these?

Cheers,

lkh