Hi jetflite,
I don't think that fixed wing turbine time would be such an advantage, that insurance companies would account for.
Especialy when it comes to twins.
Loosing an engine while underway with a twin turboprop fixed wing is totally different to loosing an engine in a twin helicopter, cause both engines are working on the same gearbox and the one still working is trying to maintain Nr. - and might quit on you, if you don't react correctly in time.
Also govenorproblems are different to handle cause of the interconection of both engines.
Greetings Flying Bull