The Partenavia is a wonderful machine. I only have a handful of hours in these and that was the B model.
The owner said that maintainance costs were always mininum compared to other 6 seat twins and that is probably due to the fixed undrcarriage with engines/props out out the way of dust/stone ingress.
Refuelling can be a p.i.t.a but other than that nothing much else to report.
Engine out, it performs pretty well on one 200hp. The IO-360 is pretty reliable but with anything mechanical, nothing is bullet proof. My guess is that the "C" handled pretty well in the scenario you describe.