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Here's a quick workbench setup:
Use a sinewave generator, an audio amplifier, and an ordinary power transformer wired as step-up (most 50/60 Hz transformers work fine at 400 Hz).
If you just need this to repair something, you can first disconnect the internal power supply and connect a lab supply of the proper voltage settings instead of the internal supply. This will work if it is the powered circuit and not the 220AC to DC supply that is defective. Usually internal power supplies fail in ways that make visual clues and sometimes nose-smelling clues.
Try searching Google for rotary frequency converter or maybe motor generator frequency converter. They are rugged, efficient, and output a nice sinewave.
I think the operation is a little bit like UPS but without the charger and battery. First from 220AC to DC and then DC to AC. Please see the attachment.
I've seen such a thing used with the old military radars.
It consisted of a 50Hz motor connected to a generator by a transmission gear.
I know it is hard to do it but the other way seems a bit more complicated to me.
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