True. Probably the easiest is to AUTH and then have an auto-send invoice (in a Nip-17 mail) when your not in my network.
Discussion
or maybe this:
nostr:nprofile1qqsyvrp9u6p0mfur9dfdru3d853tx9mdjuhkphxuxgfwmryja7zsvhqpzamhxue69uhhv6t5daezumn0wd68yvfwvdhk6tcpz9mhxue69uhkummnw3ezuamfdejj7qgwwaehxw309ahx7uewd3hkctcscpyug s realy notice message may do the same as well.