I think the cheap solution to this issue would be to build a FTP / rsync gateway which rsync'd the available data and offered the data with FTP services. I'd budget $500 to build such a service and $20/month to run it, depending on how much data there is, although it's likely to cost less. I imagine some enterprising engineer would build it for free in exchange for permission to include a one-line acknowledgment to their engineering cleverness in the FTP service's greeting. Build it as a docker container based on a small linux distro.
The only problem I see is that port forwarding from ftp://ietf.org but I imagine someone around here could manage.
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