I used a hand held 3 axis gimbal for cellphone and had it dangle straight down. It added a lot of weight but the h handled it well. You have to hand launch and catch because the handle is about a foot long.Ha! That is cool.
Can you show us a photo of what it looks like attached to your H when you get a chance? Sounds pretty amazing! Personally, I've often wondered about putting an FPV camera on the H. I know there's a mod for the inspire that looks nice and sleak, but nothing for the H yet. I'd like to be able to fly FPV with somebody else controlling the CGO3+
I actually have the Samsung Gear 360 but haven't tried it yet on H. I've seen videos of people hanging it by a cord. Bad thing about 360 video is you can't mix it with standard video. Watching your own 360 videos with gear vr goggles is pretty cool.