I have a A-MAZE-N pellet/dust maze, a 6" and an 18" tube smokers and have tested with all of them.
I have had the worst luck trying to keep the sawdust in the maze lit.
I have had the best luck with the tubes and pellets. They do give off a little more heat than the dust, but I use frozen soda bottles to keep the temps down and that works awesome. Since you do not have as much vertical room in a #2, you may want to consider 1-Liter or 20-Oz bottles instead of the 2-Liter ones. Really any type of vessel with ice in it will work as long as it holds the moisture in.
Just make sure you don't use an open tray of ice, which will add moisture to the box and will result in black moisture drops on your cheese/meat.
I did a cheese smoker a couple of weeks ago and my smoker temps never got above 60 degrees.
Some day I am going to get a variable speed air pump to help move the air around in the smoker which should help keep the A-MAZE-N devices going.
There are a lot of posts about using the A-MAZE-N devices that should help with your cold smokes, but feel free to ask your questions in new threads as well if you are not finding answers to your questions.