I wonder if I could make a poor man's version by filling a very thin plastic container like the kind used for bottle water and fill it with baking soda and att

I wonder if I could make a poor man's version by filling a very thin plastic container like the kind used for bottle water and fill it with baking soda and attach it up there. If the heat melts the plastic, the powder will be dispersed and any flames will cause it to decompose, releasing CO2, hopefully snuffing them out.