That's exactly what WebTorrent does by using webseeds. It's providing a redundant source for chunks while maintaining the raw performance of a traditional source.

An array of webseeds in the magnet also allow it to download chunks from disparate CDN's without a load balancer to handle that in the back-end, if one gets rugged your links still *just work*

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I think the “near zero latency” is still a valid UX concern.

Do you know if it’s possible to setup a webtorrent library in a way that it is forced to try fetching from HTTP the first couple of chunks and only after a short delay fire up the lookup for seeders?

It's already doing that, there's no round-trip to a tracker required before hitting the webseed directly to get the mov atom and first chunks.

It's just a client that makes use of additional data.