You're point about cancer risk is a good one.
I don't know about artificial Vs. natural smoking persay, but when researching wood tars compared to petroleum derived tars, the papers I found all gave wood tar a glowing report, to the point it was considered a tonic, while damning the petroleum based stuff.
Mind you, these seem to originate in places where wood tar products have traditionally been consumed internally, as medicine and flavoring.
These cultures are known for health and ling life, but....
There are all kinds of studies on the cancer causing effects if various foods and methods of preparation, so many, with so many conflicting conclusions, that I tend to just throw up my hands.
Maybe wood or solar powered dehydration would be a safer choice
On a different note, do the seals on the fridges and freezers in the Philippines successfully exclude the tiny ants and other pets?
I imagine derelict appliances are harder to come by there, but if they are available, they could make for a nice storage cabinet.
It occurs to me that the convenient meals you seek might better be created from the cheapest natural resources available there, labor.
Rather than cooking the way you like it and storing that meal, teach someone to cook the way you like.
They cook for you every day, you compensate them, and ideally, you make money selling any extra meals, thus storing the extra meals as cash.
A lot of potential problems there, but it is the traditional way one can maximize the out put of skilled labor(you).
Cowboys had Cookie to make them meals, maybe you and your wife could benefit from one as well.
Just to put this idea into context, this is roughly how my grandmother went from being a talented home cook to a teaching gourmet cooking classes and catering events