I wonder if you could program a nfc sticker (like an ntag213 rf-id tag) with minibits and lock the token to either an npub recipient or just a password, or none at all. Is 144 bytes enough storage to hold most tokens?
Minibits can write the token to the nfc tag and lock it to the public key (Send ecash > Lock to pubkey > Create token > Tap on nfc icon below QR).
Need to be NFCTagType4.