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For what it's worth, BiglyBT already has its own DHT network (even before BT v2 support was introduced) that stores individual file hashes. Called Swarm Discoveries - you can look up, say, the exact file size in bytes of a (large; >50MB IIRC) file and get results if it's out there.
I agree with this statement at a base level, but I'm also going to say that hybrid torrents are a thing (single metadata file that has all the data necessary to join either the v1 or v2 swarm), and that with the exception of a couple of incompatibilities (piece length must be a power of 2 in v2, and some extra strictness in the bencoding), it should be possible for a torrent client to convert a completed v1 torrent to a functional hybrid torrent with just a rehash. You can use torrenttools with some of the examples here - https://github.com/arvidn/libtorrent/tree/RC_2_0/test/test_torrents - if you want some examples.