i havn't done the conversion - but the gearbox is independent of any of the pedal stuff so if you make it work with a 4 speed, it'll work with a 5-speed too.
i should think once you swap the pedal box (and the rack! yuk!) all you'll need to do is find the shift linkages and rods and stick. you may not need to swap the rack if you can make up some of your own bracketing to hold the gear linkages.
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