NIP-46 bunkers. Issue them each a token. nostr:nprofile1qqspwwwexlwgcrrnwz4zwkze8rq3ncjug8mvgsd96dxx6wzs8ccndmcpzamhxue69uhkv6tvw3jhytnwdaehgu3wwa5kuegpp4mhxue69uhkummn9ekx7mqpzpmhxue69uhkummnw3ezuamfdejsul2dhz is dropping what looks to be a great tool for this "before Christmas."

That said, you can technically do this with Amber, too, but it would be better running on an always-online server, like a Start9 or Umbrel.