I wouldn't be mounting anything to the helmet with the VHB tape on those go pro mounts. I had a low-side last year and my intercom went flying one way, off the helmet safely as the mounts are made to do so. Not in many reports, however after Michael Schumacher's skiing incident, reports said a GoPro mount went through his helmet, years later he is still in a coma. Take your chances.
As for no gear, the day I low sided last summer I was in full gear, walked away, infact the only place I had taken the Armour out was the hip pads( they were the velcro foam type and after days in the saddle my butt was sore, so I put them on the back for cushion, well, took the bruise on my hip about 6 months to heal, my butt is well lol). The day prior, it was over 35c+ and I was sweating uncomfortably, so I rode without the jacket. That morning, it was a bit chilly and so I had it on, It's sitting in my closet ripped up, I shutter to think what would have happened if I was there 1 day earlier. I always thought hiking shoes were okay for a motorcycle, before that trip I got a pair of proper Alpine star ADV boots, they have the marks to prove their worth. The gloves, well, the plastic palm protectors and knuckle guards burnt off, talking close to 1/4" of hard ABS right off, can't imagine I would have any knuckles or palms without them right now.