Budget action cam with remote start/stop?

[backofbeyond]

Old GoPros capturing in HD quality have perfectly good enough for most of my needs, but controlling them on the move, where there's only you and you want to switch them on and off as you ride is not easy. I have the official GoPro remote but that's not a lot more usable as it still requires you to fiddle with it. A simple handlebar switch - like repurposing the horn button for example - would be much better but the only stuff like that I've seen (for motorsport use) is crazily expensive.

I have a couple of old Hero 4's that still work well - or they did until last summer when one of them suddenly stopped recording video when the bike was moving. It was fine when the bike was stationary, or if I was taking a still image but not when I was riding. I tried two other cards with the same result so my guess was some sort of vibration issue. Both of them were hard mounted on the bike so that may be the problem and a chest or helmet mount wouldn't suffer from that. You live and learn but it was disappointing to come back with little footage. I'll be putting a lot more testing effort in before next year's 'adventure'.