Yeah you will have to get a step transformer to get it up to 460, then put a 32 volt buck boost transformer on it to buck it back down to 428.
The big question is how deep are your pockets? I know Ronk electrical and Gentec both make three phase converters that will take 240 single and make it 480 three phase with nearly perfect phase angles. They can probably put an extra tap on the transformer for a 415 volt output, it just won't be cheap.