I didn't do a conversion, but my power ice auger for ice fishing is a propane. Jiffy Pro 4. Starts much easier than any other I have used. Cuts hundreds of holes on a 1lb can, and has plenty of power. Only down side is it can spill oil if tilted the wrong direction.
Only once did I have an issue in the cold starting my auger. -38F (air temp) it would start, but would run short of power as the 1lb can would not "boil" fast enough to meet demand. Just changed the tank to a warm one & drilled all the holes I needed.