A couple of people have PM'ed me to contribute to this thread. I am NOT a professional pizza maker, just an avid home practitioner seeking to make the best Neapolitan-style pies I can. Engineered Ceramics may want to float his ideas over at the forum at
http://www.pizzamaking.com where there are many hardcore practitioners of the art who wold be more than happy to provide input.
There are all kinds of pizza styles that are popular and many of those can be made in home ovens and grills with no special equipment. One notable exception is the Neapolitan-style which uses different ingredients and methods. One of the most important is a very quick baking (60-90 seconds) in an environment that blasts the pie with heat from below and above. In my brick oven, the heat from above is radiated down from the dome (>1100F), but also from the embers and flames which shoot up the to the top of the dome and down onto the pie.
The unique composition of the dough and the intense heat create a magical transformation of the texture and taste that is unavailable any other way, IMHO. A Neapolitan pie would not look like the one pictured above which looks to have to cooked too long at too low a temp for a Neapolitan pie (I'm not saying that was the intent).
So the proposed insert may be great for all kinds of breads and pizzas, but it may be a challenge for those who want a Neapolitan-style pie. There are folks who use gas grills or home ovens in the self-clean cycle and other tricks to get up to around 800F on the stone. Colleagues of mine that adopt these approaches admit they would rather be using a proper pizza oven designed for the purpose. Rather than a pizza stone or enclosure for the grill, your company might look into making prefab wood-burning ovens. My very-biased opinion, FWIW.
Bill/SFNM