Just get a trackIR 5 it's brilliant. Been using every iteration since the first one. I don't game without it.
Yes, you just have to either mount the track bracket dots to the helmet or use the track clip pro. But there are YouTube videos of people using it with HMDs. It's the same as using it with a conventional screen, but better as you can set it to 1:1.
How do you like the HMD? Been looking to get one but always sold out.
The problem with the head mounted devices is fairly low resolution and low FOV. The TrackIR will help with this, but I don't think head mounted devices will catch on until they offer a larger FOV.
I use TrackIR 5 and triple screens, works great!