But for that to work would the receiver also need to use NIP-24?
PSA: pretty soon, NIP 04 DMs are going away, and will be replaced by NIP 24 DMs. The current version of Coracle's DMs can still be accessed at https://nip04.coracle.social, which I will link to from within the new version of Coracle as well.
Discussion
Yep. I'm thinking about compatibility stuff. Maybe sending a NIP 04 that notifies the recipient that they have a NIP 24 message waiting for them. It'll be awkward, but it's gotta be done.