Alex Gleasson did a great job with blossom uploader for nostrify(as a ditto can store media there), which script I am using to bot upload random media to blossoms(including my own), and the bot posts the link in notes on feed of whichever responds first. These links to media in note work even if the said blossom(from the domain in note link) is down as it finds the other blossoms upstream, same hash (which is how a blossom-server is configured to work) and still runs the media. That is working in clients as we speak, the only problem is with clients that need the media extention to display, link still works. The bud that you are looking for is 04 as option which is for mirroring of the blobs instead of reuploading everywhere.