well i can't remember, but if the 5 1/4" connects to a standard ide cable, you could buy an external case for a cd burner or something like that. I took apart my old 4x external backpack cdrewriter, pos i know.
But the cable was USB for the computer and on the other end was parallel. Inside the case on the circuit board there was a connector for the standard ide interface. it might work, probably the biggest issue would be a driver.