Not sure how those are made, but IIRC, its a high frequency unit. In that case you probably wont be able to get around the circuitry. If its just a transformer and the board is only for output control, then you may be able to jump out the board, but it will be at full output.
If you need more O3, I've heard that the little Enaly units from ebay are actually pretty decent, especially if you have the dessicant setup.
At work, I used to use the commercial kitchen ovens for regenerating the dessicant. About 2x a month I'd dry several gallon cans worth. I stored it all in new paint cans til i needed it.
Those large ovens were good for thermoforming acrylic for Nano Bowfronts too
