If I wanted or could do things traditionally (i.e. Mizuno-style plasma electrolysis) I wouldn't have called the thread "unconventional"....
Sorry, my purpose was not to critisize your tests. It's nice that someone shares openly all the results to the interested ones.
I just wanted to show that test as one example of getting good results. Maybe there is something that could be scaled down from 200V level to 12 V. In your case the max. power is ~ 120 W v.s. the Naudin case ~ 700W. And as you mention short-circuit that means that the voltage level requirement is quite low.
One thing that has been bothering me is that already at that time Naudin could get > 2 COP with quite a simple arrangement, when e.g. for Brillouin it is hard to exceed that value with much more sophisticated system.