Tobi, here are a few observations given with the best of intentions:

It's been gently pointed out that the problem you're attempting to solve does not exist to any great degree for anyone here.

You've received this feedback from a very experienced focus group, but you're not doing much with it.

You've been urged you to look into other types of stoves where we do see room for innovative solutions, but you never even asked a follow up question about that. You should never let a path like that go unexplored.

You can not do better than starting off with looking to refine what the DYI crowd is doing at any given time in the category your looking into. That is the very cradle of innovation Tobi. It always has been.

It's also important to realize that changing course based on what you learn is key to success in any venture. Today, more than ever, it's absolutely critical to understand this.

As of yet, I've haven't seen that in the progress of your interaction here. This suggest your looking for affirmation as opposed to information. That can be a costly path. The "Segway" is an example of an amazing product that used that approach and fell flat on it's face despite it's amazingness being affirmed by very respected sources.

I suggest you step back, forget for a moment your initial approach, forget you even started this thread, then reread all that's been offered to you here with fresh eyes and see if you can come away with anything new from it.