Paul, here's a moneymaker for you. No charge.

I have an idea. Make a chamber that can retrofit onto most existing wooodstoves, that turns regular woodstoves into rocket stoves. But, instead of your usual 55 gal drum, the top is clear quartz tube on the inside (creasote burn chamber) and a Pyrex bell, so we can see all the pretty flames. Exhaust vents at the bottom of the bell, and goes wherever... rocket mass set up, metal pipes around the room, whatever.

2 potential problems.

1.  quartz molecular structure undergoes a transition at just over 1000 degrees F.  Alpha to Beta transition cause thermal stress and cracking.  So the temperatures would have to move very slowly over the whole structure.  Might be solved by doing it in small blocks.

2.  It would likely function poorly because of the high mass and because the heat wouldn't be reflected back into the burn tunnel and chimney.

i am sure that if you funded the purchase and delivery of the schott glass tube required for that ai drawing , there are 460mm diameter tubes available made to order ---no prices given,with larger  diameters as special order s after consultation----that Paul could assemble a team to build your dream and test it .