Just a thought....
I would think that having a copula or a top story containing operation windows would suffice. Even here in Texas, there are certain times of the year that I can open the southern facing windows and doors as well as the northern windows and doors and get good ventilation.
Is there a good wood-burning method for creating a draft for ventilation? I'm just curious. I thought maybe another input could be attached to the burn tunnel of a rocket mass heater, but that would probably prevent it from working at all.
The regular intake of the RMH will cause a negative pressure that will cause outside air to be pushed in cracks around the house... Unless your house is air tight.
One of the videos with Ernie Wisner shows a system with a valve to bypass the thermal mass, to get a good updraft as things get started. If you added onto that an airtight, insulated cowl, that forces the air intake to draw from registers leading to the warmest parts of the building, I think that could work.