Using to diodes for OR'ing in OVP comparator
If your approach simulates well, then you can prototype it. It sounds like the OVP detector is some type of comparator with a line disconnect switch, which you could simulate. I'm not sure if timing is critical.

On the other hand, other approaches, which can be used together or separately:


Vin and/or Vout has a series PTC resettable fuse followed by a an appropriate TVS shunt. This will provide its own blanking and OVP without the extra Maxim IC. The TVS is the OVP, and the resettable fuse will shutdown the power until it's hold time is cleared.
Choose an alternative buck regulator with built in OVP and OCP. Many include this protection already.