I was recently in Guatemala at a permaculture farm called Granja Tz'ikin where they created biochar from the stove that heated their temazcal (traditional sauna).
They used the biochar in a couple different ways including adding a small percentage to their goat feed for additional nutrients.
Your idea seems to be reasonable and supportive of a self reliant lifestyle, so I would say go for it and scientifically study your process to use as a foundation for a petition to the government for its continued use of the laws change.
