I've given the link you posted a quick once-over. From what I see it is possible to create a OPDS catalog from your Calibre library on a Dropbox server using a Mac. So, again, what exactly is the problem? Granted, the solution doesn't work from Calibre internally and requires some manual labour to set up, but it works. It should work behind whatever network infrastructure Dropbox works from, so it ought to work for your case as well.
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