We're not talking efficiency here. This is a hobby; who cares about efficiency? If this becomes too large a white elephant, we will use a resistive load as has been done forever. I was just trying to be creative and come up with a new trick, that's all.
And as for scrubbing the oxygen, all one need do is pass the H-O mixture under its own partial pressure through steel wool and it's a done deal. I wish adding a carbon atom was as easy!
. . . . . . Mac