Hi Mark,
In New Zealand you can buy a converter to shift the FM frequency band up 10MHz so that you can listen to the NZ radio stations on radios in second hand cars imported from Japan. Maybe you can buy/build something similar shift them down 10MHz so that you can listen to the radio on an empeg in Japan. The only downside is that the Display still shows the "wrong" frequency, but I'm sure you know how to add and subtract 10 ;-)
Good Luck,
Derek
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(list 6284, Mk1 S/N 00299 4GB blue [sold]. Mk2 S/N 080000094 20GB blue)