Could you take some metal rod of some sort, and weld/attach it to the ID of the camber plate, and to the sides of the strut bushing, then pour the goo in? Would that act a little like rebar in cement, in terms of keeping things togather under load?
Looking at my current front camber plates, they are the Tarrot style, with a spherical bearing solid mounted in an aluminum piece. Could you weld/attach that bearing to the inside of a stock camber plate with the rubber and stock bushing removed, and get the same result?