Regarding the suggested options to open this event, did Jon provide those, or are they provided/recommended by you Pablo?
add in NIP-89 support and now coracle can even open a client that can handle that unknown kind
https://video.nostr.build/6b9c22f94ccf9d8bbc7c7873bf7caa1e1636ff97ed3fa4fea7f2bab2d9e6eae6.mp4
Discussion
None of the above.
They client asks around for handlers (and might or might not store / know about your favorite apps for it).
afaik