Unfortunately Bitcoin requires internet. Machankura also needs internet on their systems to interact with Bitcoin.
Nostr could help reduce Bitcoin's reliance on TCP-IP though - and your reliance also...
* Your server can lose access to it's domain or it's IP address, but your npub can't be censored.
* You can self host a nostr relay behind a static IP (paid in Bitcoin) from a VPN provider.
* You can use TollGates to reduce your reliance on ISPs: https://github.com/chGoodchild/GLTollGate