If your tender hands are really bothered by the heat, you can try cutting your own heat shields out of some aluminum roofing flashing.
alternatively, you can use aluminum tape, or fiberglass sheathing, or fiberglass aluminum tape, or fiberglass insulation batting stuffed under the barrel-- if anything it will keep the handguard from melting.
As mentioned, it will reflect the heat, or insulate, and keep the barrel hotter. An upper handguard. like bonesteel or PRI will absorb the heat, and increase surface area and mass, for radiant cooling.
