Seems perfectly reasonable and would achieve the desired goal of making it clear it's a third party package not "official" OBS.

That is in fact one of the solutions proposed by OBS: "We would like to request that this package is either removed, or made clear that it is a third party package."

Which seems pretty reasonable to me, so I can't really fault OBS here.

Yeah, but in this case the issue is so minor Fedora should just fix it.