I'm not sure I understand how it would not be possible to combine the several concepts that I will list below.
I'm no hvac nor energy conservation guru but the concepts seem like they should be possible to combine for maximum harvest.
1. Rocket Mass Heater design with stove top.
2. Sand Battery for stove top and energy preservation
https://youtu.be/ejTsdtZHRPw
3. TEG (thermal energy based) fan to distribute heating while being on top of the stove top sand battery. Best materials for sand storage and insulation of sand storage TBD. May also be able to create leads to store in a different battery if/as desired. Portable sand batteries possible.
4. Extraction of creosote and more refined fuel in iterations for later biodiesel usage.
https://youtu.be/5dbvJ3oXYoc
Am I overthinking or not thinking clearly about this? Appreciate your input.