Wiring two fastback switches to one controller ?

Yes, just hook up the single controller to both switches. It will work just fine. This is the right way to handle a crossover, which is what you have described.

Connecting a single controller does not effect the non-derailing feature.

You through the inside to outside diverging for a train going clockwise. It is left in that position and an outside loop train approaches the switch from counter-clockwise direction. Snap. It's moves to thru and the trains passes without derailment.

How do I know? My grandson distracted me this past Sunday and then accelerated his train and hit the switch in that fashion. I looked at the lanterns and then hit RTE 1 thru and returned the pair for both loops.

One caution, only connect the yellow lead from one switch to the controller.  Those are polarity reversing outputs for the bi-color LED indicator, and if you manually change one switch, or it changes due to a non-derailing activation, you have the two voltages fighting each other, probably not a good idea.