I bought a 2 burners portable gas grill from SAMs club for $99, each burner is 10,000 btu. It is not a perfect fit for MPO, I improved that by removing the grill lid and a bracket that supported the lid.
I heated MPO2 without bottom stone first for 10 minutes and for 14 minutes with MPO2 bottom 14". Bottom stone varied between 600 and 725 F , top stone varied between. 700 and 825 F. Outdoor temperature was 50 F
With this setup I can easily do 2 to 3 minutes pies. I am planning to bake few pies tomorrow using KAAP.