A wad of Seal-All or Goop would have held it on, or perhaps a wad of epoxy. But is one those small areas with high shear and high bend potential where glue has real difficulty.
Instead, I decided to drill a dowel to make a bushing, drill the landing gear strut to hold a screw and assemble the wheel, bushing, self-tapping screw and washer. I filed the point of the screw where it came through.