I don't think you can. However you'll have to wait for more expert advice. I'm not into tuners. All I know is, that it will need more modification than just changing transformers.
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I moved from the UK to NA 25 years ago, with my QUAD FM4/44/405 system. Yes, the FM4 will work fine here. However, the FM de-emphasis in NA is different to that in Europe, 75µS in NA versus 50µS for most of the world. Consequently a European tuner will sound slightly bass heavy if used in NA. The fix is simple, a single capacitor addition in the de-emphasis circuit. I had mine done by QUAD before I left the UK. I am sure QS&D in the States can do the job for you at nominal expense. Re voltage conversions, my FM4 is dual voltage, so no problem here. If yours is not, use a $25 step-up transformer or have QS&D do the conversion for you. I am not familiar with the newer FM4 tuners, maybe it is a simple jumper change you can do yourself to go from 240V to 110V