RealAir Turbine Duke V2 is amazing, top level simulation despite being years old. Couple of things to note, it is compatible with the GTN 750 but no icing effects and the only rain effects are the default P3D ones, better than nothing though!
If you can hold out at all, Milviz's B350i & B350-not-i will be coming which will feature everything you asked for! And as a sidenote, the Airfoillabs (AFL) king air in x-plane uses the same visual model as the Milviz's one, so it will look just as good in P3D but with a glass cockpit and more detailed systems (steam in the non-i variant) just depends if you can wait a couple more months for release
Hope this helps