A more interesting thing would be a proxy that serves html notes, no ephemeral events needed. That would be useful for creating an http-to-nostrweb proxies, and allow you to create webpages without hosting. You just lose signature verification but maybe you could serve the signature and other fields in response headers so that the client could verify.
I think Vitor Pamplona (npub1gcx…nj5z) made an html spec at one point if I remember correctly?