Miche and Izumi track chains have bushings, and I recently bought a ⅛" chain from KMC with bushings (marketed as a single speed chain). I used the KMC chain for the Schwinn Racer because the Union chain on it was very stretched after a thorough cleaning, but the original chain on the Hercules measured like a new chain, even after an Evaporust bath.
That said, if you can get an industrial ½" pitch chain, go for it I guess. It's not a secret that bicycle-specific consumables see a hefty markup over their industrial and automotive twins.
If I had to venture a guess, an industrial chain will have little to no rust prevention compared to a basic bicycle chain. Bicycle chains are likely only second to chainsaw chains in the amount of abuse they normally see.