Warmaster Horus
Explorer
For many players this falls into the realm of "cheap cop out" as well. If those are your players then that would only make them mad.
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Why? There are Drow-crafted weapons and no one complains (much) about them and their sunlight sensitivity. Just make it a tradition in your game that there are demon-forges that craft fine panapoly for evil dudes or the like. It's puzzling to complain that if you give creatures magic then you turn into a Monty Haul game yet say that having monster-attuned-only items is 'cheap'. Players will accept all kinds of flimsy fluff to explain that kind of thing away and will get even more excited when a 'real' magic item turns up.