We used to suggest the Hammond 369AX, which requires a change to a FWCT power supply (from FWB originally) but does have a 230v/50Hz primary.
I wouldn't go the series route because of the risk that any failure of one channel would spike the voltage on the other, killing too many other components. It would be a bear to debug any time anything went wrong.
If you can find a small 230:120v stepdown, it might fit on the chassis along with the original, and would give doubled power line isolation - that could be a good thing.