First off thank you, I appreciate that! You definitely have to love this business to be in it, that's for sure!
I actually came across your comment about what you said using a smoker gun and I am not to sure about that to be honest. I am not sure what is behind the "science" of what you would be inhaling exactly but I would imagine it to be quit toxic. Taking a standard wood chip smoker as the smoking gun (pun intended) you are essentially adding the residue from burning the chips into your juices. I can't imagine this to be all that safe to inhale, eating is different sure but it still isn't "good" for you. Even a simple grill mark on a steak is loaded with carcinogens and burning anything really isn't that much different.
So I guess it all comes down to how much you care haha. Will you be able to add that smoke flavor to a juice, absolutely. Is it a good thing to inhale, well in my personal opinion, I am going to have to say no. I can't say for a fact that it's a no because I am not an expert in that field, I just know that the burning and inhaling of anything isn't good.
This really isn't any different from placing you bottle in a crock pot, except for 2 things...it's in a vacuum bag (which makes no difference since your bottles are sealed anyways) and you would be placing your juices in a much higher temperature of water, about 200-212 if you are boiling or simmering. Either way you would essentially be bringing the temperature of your liquid almost up to that which would be the water surrounding it, regardless if it is in the bottle or in a vacuum bag.
I would still stick with a water bath that is very low in temperature so you don't degrade you liquid and just enough to loosen the VG or whatever. 115-150 range maybe? The only benefit I would see to doing the "sous vide" way, which again, is just in a vacuum bag, is that they are completely sealed. So you could do this in a crock pot and vacuum pack a dozen or so bottles and just throw them in there and not have to worry about standing them up or submerging them. Throwing them in boiling or simmering water just isn't good for the juice or bottles, either way you go.
Hope that helps!