I’ve owned an Oculus Rift CV1, Rift S and now have a HP Reverb G2.
Unfortunately you would have a terrible experience in MSFS2020 with a G2 and your current PC. Motion sickness is a real problem with VR. High frame rates and low latency help with that. Both of those things are almost impossible with MSFS2020 and a high resolution headset like the G2 (without blowing serious money on hardware and even then it’s not great). Even a low resolution headset would probably struggle because the sim is so CPU bound.
The motion sickness is something that can be overcome, I used to get it and don’t now. I’ve gotten my ‘VR legs’ but this sim is probably not a good place to start as it is. Unless you intend to buy a much more powerful PC, buy a Rift S and get your ‘VR legs’ with that. Something like Elite Dangerous will blow your mind, help you get used to VR decide if it is for you. The Apollo 11 experience (from the oculus store) is well worth a try too.
One thing though… If you feel sick in VR don’t try to power through it, take a break and come back. Any sickness you feel won’t be permanent but some people that try to power through it never get their ‘VR legs’ and instead get motion sickness faster.