Turn a forced air furnace into a rocket mass heater?

Hi! I was wondering if anyone has ever tried adding a rocket mass heater in conjunction with a forced-air furnace? I was thinking of some kind of passage of duct that's also a mass heater.

My house has a furnace in the basement that blows air up into the vents on the main floor. I would love to find a way to burn wood fuel to heat the main floor so I can use less natural gas, especially since I have enough wood on my property to supply my annual needs.

The main floor does not have enough space or structural support for any kind of mass heater. I could also try doing some kind of heated water tube system like a boiler because the under-side of the floor is very accessible.

Would love some ideas if you've got any. Thank you!

See attached photo, mind the mess:

Hi David; Welcome to Permies!   And Welcome to the world of rocket science!
A couple of questions.
Does your house have a chimney?
If so , how large (dia) is it?
If you do not have a 6" or better chimney. Then you will need one before thinking of having a RMH.

Were you wanting to remove your forced air heat?
Or hoping to include the RMH into the duct work?

Let us know what your thinking.

I’m up for any ideas. But it would be cool to have something that could work with the forced air. It could be dangerous to have flames anywhere near the gas and refrigerant lines.

There is a standard chimney for the furnace and hot water heater. I could try to add another chimney to flue right out the side of the house somehow.

Really just spitballing ideas at this point. But it is something I would realistically do if I had a good option.

I could see my wife hating having ac window units. I do have a whole house fan and could work on cooling the house in other ways if it comes to reremoving the furnace.

I'm contemplating the same problem.

First rule: don't mess with the existing furnace or its operation.

Since I also have a lot of surplus wood, I have been contemplating an outdoor furnace. There are commercial units; but a mass-enhanced wood burner in a nearby insulated shed could also supply heat via forced air or pumped glycol. This would supplement the house furnace in cold seasons, and perhaps replace it in the shoulder seasons (furnace becomes a recirculating air mover).