You could generate a revocation key and then encrypt for multiple people using Shamir’s secret sharing.
https://en.wikipedia.org/wiki/Shamir’s_secret_sharing
Look into ssss and gfshare, the latter explicitly discusses this use of the algorithm.
https://manpages.ubuntu.com/manpages/noble/en/man7/gfshare.7.html
The concorde took 180 minutes (3 hours) to travel from New York to London (3,000 nautical miles).
Ignoring range limits, a trip from New York to Tokyo (5,861 nautical miles) at that speed would take 351 minutes (5.8 hours).