I mean for that, my phone works fine. I set the bixby button to turn on\off the flashlight. Single button on off always on me. Of course being programmable, you could program a simple on off as well on the hex.

I used the hexbright camping and stargazing. The hold setting is so dim its useless unless you’re in pitch black and just need to see the star chart. And you don’t want bright as it takes at least 30 minutes to recover your night vision after a bright flash so that’s what my use case was.