Careful, your western nature is showing in that you think material possesions equal happiness!
cognitive dissonance much?
Sure, biochar may have slight benefits over compost, but do you have any clue how much it would cost to collect and distribute? No, of course you don't or you would know that the economic gain (if any depending on your part of the world) wouldn't outweigh the cost of collection.
This is not sustainable tech and is just a money grab looking for suckers who don't understand numbers (or can't be bothered to research them because hi-tech is always the best answer.)
Every single idea that was sustainable and easily built and maintained by locals was rejected!!
If for some reason you want pyrolysis instead of composting why not design a solution that people can build themselves. Say, a parabolic trough collector focusing on oil filled piping to heat the fecal matter. Such collectors built out of aluminum foil have been shown to be able to get temperature above 400f.
oh wait, but then Bill and his cronies wouldn't be able to get rich.
On a side note, I'll definitely try some experimental designs in nica now especially since I have to make collectors anyways for the solar kitchen. I was worried about containment size required for a composting toilet to accomodate large groups of people. Only having to deal with days worth instead of months worth would be a boon. Have to test out whether the biochar is as effective a soil supplement as the compost as well.