I bought some hard-wired sconces which must be converted to plug-ins. Problem is their ground wires can not be used (Lutron's plug-in lamp dimmers are only 2-prong). Will installing GFCI outlets be a safe way to get around the grounding problem? I read the NEC allows this. Sconces are brushed nickel which I looked up isn't very high on the conductivity chart anyway. Thanks anybody.