here's a demo using https://nip26.lol to sign and publish an event with a NIP-26 delegation token.

What is NIP-26?

NIP-26 enables signing events with one set of keys on behalf of a different set of keys, under certain restrictions.

https://nostr.build/av/nostr.build_22f8d32b5e06fe85777da0923651c6d6427a88cd305081c0b79703bd3164da53.mp4

If you want to test it: build and use my fork of #[0]'s nos2x or my fork of #[1]

Nos2x:

https://github.com/pablof7z/nos2x#develop

Getalby:

https://github.com/pablof7z/lightning-browser-extension/tree/feature/nostr-nip-26