I enjoy this concept, though I was under the impression that defibs were still in the blueprint cases, and a fairly common drop - though I could be wrong, as I really don't play as much as I used to. Plus, with the massive selection of items in the blueprint case (I think it's like 35 or something crazy like that) every single one of them has a chance of being dropped, and I suppose that does change the existing percentages.
Anyway, good idea. It's always good to give us new NPCs, and more of a reason to use certain buildings. Would be nice to think of a use for that big-ass mansion in the park district, too.