To me, the vexing problem is there are no published speaker parameters for the CHB. Some claimed that they were fashioned after the Fostex FE103A. Most seem to agree that the CHB's perform well in larger cabinets or open baffles.
I can't see any reason why not. Oliver Sayes built my 45 SE using the Korneff circuit. In my case it is a single 6J5 for each channel. In the Simple 45/46 Joe calls for 1/2 6SL7 for each channel. The Sony PT has a lot of 6v capactity, so the extra tubes aren't a problem. The circuits should be near identical.
I'd be a bit concerned with the current-handling capability of the Sony PT - It's two beefiest 6.3V heater taps are only rated for 1.5A, and a Type 46 tube draws 1.75A. I'm assuming due to Ohm's law that any voltage divider used to drop the heater voltage from 6.3V to 2.5V will drop the current, however slightly.