Far as I know Super O switches work with up to 042 stuff at times. To use with an 072 engine, I would say go to that track size, as you are asking for trouble with anything smaller then 072 curves.
Atlas probably makes a switch in 072, so I would go with an Atlas switch.
You can have an inside run of Super O track but don't use the larger engines or freight cars with it.
I have an inside track with S gauge trains.
Lee Fritz