Honestly, I think all the safety stuff is overkill for a smokehouse. I will never argue with someone who wants the safety in place and if you want a set and forget set up with gas then the safety features as well as temp alarms are a must.
In my smokehouse I use a simple turkey fryer burner. I have a 4”x10” air intake low almost at ground level, (screened) in the front and a 4x10 exhaust high on the back wall. This creates very good draft or ventilation. I baby sit my smoker every 15-30 minutes, so I’m constantly checking temps and flame. Twice I have had the burner blow out, both times in windy/gusty conditions. I shut off the tank, open bottom and top doors, air out, relight and smoke on. I’ve never had a flame issue on a calm day and is now the only time I use the smokehouse. I have other ways to smoke meat in a pinch or just wait a day or three for clear weather.
In the beginning I smoldered wood chunks in a cast pan on top of the burner. If I had smoke rolling out the exhaust I had flame, if smoked stopped you better go check. Now I use a smoke generator, so smoke rolles regardless but I have a good maintenance system down and my smokehouse works very well for me. Simple, relatively cheap and very effective. YMMV.