Kalif
The problem with the instrument rating, with reference to these sort of ops, is that when you really want to use it, you stand a good chance of not being able to. The 2 main limitations usually being icing and fuel reserves.
Additionally, once you instrument rate a pilot specifically for these ops, you really need to allow considerable IF flying to maintain a satisfactory standard. Unfortunately, these sort of operations do not generally lend themselves to disappearing off for an hour to bash the hold!
Now if you were to offer me NVG to go with the instrument rating, then yes please - best of both worlds!!
Cheers
Tees