would be interesting is if I could use a bech32 instead of a URL, and then the URL shorterner service could use NIP-89 to send me to my favorite client instead of to a hardcoded one.

That way I could share a, e.g. NIP-23 and when the user visits it the shortener service could check which NIP-23 handler I like and send me to either habla.news, highlighter, Yaki Honne, Blogstack, etc