As I said, it's a proof of concept, but to me it's pretty much there already.

What I think could make it work much better is to have a layer that treat those event/files as pure text content like how it handled the rest since now and inject them in a iframe or similar (like with BlobURLs), then you won't even need a server for serving them, a simple JS script would let you build all the widget, clients or whatever you need anywhere you want.