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If they’re supposed to be binary-identical data (same file checksums), you can use BiglyBTs Swarm Merging feature - without manually copying (which isn’t as reliable due to the start/end of the files not bordering on the chunk boundaries.
If they’ve been modified in any way though, this won’t work. However, you might be able to use its Swarm Discovery to find other torrents with the same data and complete with Swarm Merging.
Wouldn’t you be on CGNAT though? How are they blocking it - at the DNS level? Have you tried a CNAME record that points your own domain to the actual duckdns domain? Just curious how/why they might be doing this.