Yes. On that track. I think nip 26 is like if you have your keypairs stored away, in a device or signing device and don't to pull it out to sign each event/note. So you delegate a different keypairs you created to sign on your behalf.

Think an organization has a master pubkey for social media or whatever.

They can delegate with the master key, other keypairs for user to post in their behalf. Think if you hire a new employee you don't give them master keypairs you sign a dleegstion allowing their keypairs to sign for the organization. And i assume you can revoke as easily as you can grant access.

The other thing would entail your old pubkey having some flag recognized by the relays to include your new pubkey content in quietes for your old pubkey. So your old followers would get your notes w/o even having to refollow.

Like I said not sure if possible. Not a super technical guy, just enough to know I don't know enough.