If you want to get away "on the cheap" and without major work, the bore can be bushed with UHMW or other self-lubricating plastics. Cut and shape a piece to fit the shape of the distorted bore (the stuff is easily worked by hand). Leave it a little large and press it into the bore. Drill it out to the proper size and it should last for a long time, if there remains a sufficient amount of plastic.
An end-mill can be used to plunge cut an accurately sized hole that will accept a bushing made of the oil-lite bronze, that Bob mentioned, or Roulon or other PTFE materials. The plastics can be massaged a little to fit a less than precise pilot bore. A drill press and a sturdy clamping fixture would be a minimum requirement.
The re-bushed hole would not need to be located on the exact center of the original as the position of the shifter can vary a little without ill effects. I have used plastic milk jugs, brass shim stock and a variety of other materials, when the need has arisen, with a great deal of success.