After thinking about everything I posted above, I'll be going a different route for future smoking. I decided that the bootleg smoking technique with the aluminum trays is just too risky. Now I'm not yet ready to invest in a true smoker, but after watching numerous videos of people turning random things into smokers I think I have an idea that MIGHT work. Years ago I bought one of these propane camping ovens:
https://www.campchef.com/deluxe-outdoor-camping-oven.html
I figure I can use the propane oven feature here to achieve the temperature you would get in an actual smoker, and then I can just toss in a tube smoker with some wood pellets (or 2) to infuse that smokey goodness into the meat. I'm still unsure if the wood pellets will have enough oxygen to smolder and if the smoke will affect the propane flame burning at all, but I think this is a safer option than what I talked about above.