Having had gearboxes apart and changed a 6 speed for a 5 speed box,it should be possible. It would be easier to swap motors complete. If you've good mechanical skills read on, find exploded diagrams of both gearboxes (not an easy task), carefully compare them also compare the crank cases. When you're confident the two are similar enough jump in and take the motor to bits, I have a feeling that you might get away with a selector drum and selector forks, but you won't know until it's all apart and the bits are in front of you.
Jonathan.
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