[Boatanchors] 3-phase for BA transmitters?

[Nick England]

Has anyone actually tried a Variable Frequency Drive as a way of
obtaining 3-phase for vintage high power transmitters?
VFD's are solid state devices that are normally used as motor
controllers, and they are available as 220v 1-phase to 3-phase
converters.
BUT (big BUT) all the ones I have seen say DO NOT switch the load
(which is exactly what you need to do in a transmitter).
I'm also wary about xfmr heating from harmonics from these switching gadgets.

Any direct experience with transmitter applications - or a pointer to
some gadget I've missed that woud be happy in the application - is
greatly appreciated.

So far the only solution I have seen is a rotary converter
(motor-generator) for 1-phase to 3-phase conversion.
cheers,
Nick K4NYW