If you use the VR controllers, all the switches work except the ones that have 3 position (ex: audio test 1, audio test 2, return to center). None of them are critical to normal operations, I just skip these tests.
If you don't want to use VR controllers, you need a hell of a lot of buttons on your joysticks or be able to use your keyboard blind, because, well, this plane has a lot of buttons!
For some reason, the throttle absolutely requires a joystick. If I move it up with a VR controller it snaps right back to zero, even if I removed the throttles from all joystick axis. Also thrust reversers are not usable with VR controllers, you must bind it to a joystick button.
The popups: fuel guy, phone for Jenny do not appear in VR. You need to go back to 2D to use them. I don't use Jenny, and I start with the fuel guy and finish it before I go into VR (or go out and back in)
Do not enter VR until you exit the FBO and are outside next to the plane.
So, far from perfect, but still doable if you don't mind the compromises. It is absolutely awesome to fly this bird in VR. You just feel so "present". It's like you can feel it's weight and inertia. I would not wait, knowing what I know.
It's perfectly ok to wait too. Hope this helps.
PS: I fly with G2