It would almost certainly mean the controller and wiring would need to be changed as well, but that's academic as the Sprint motor would only help a bit anyway. It would still be a bit too high geared due to the 700c rim necessary to match the brake position, overall diameter with tyre at 28", against the Sprint front wheel, which is roughly 25.5" overall, 9% higher geared. That said, the Torq is hugely overgeared. Taking the Quando with that motor giving 15 mph as standard gearing, the Torq is 40% overgeared, hence it's high speed on slopes but failure on real hills.
I've had a look at the contours in John's area on Googlemap, and there are certainly some impressive hills around Stockport, though the land flattens out as it heads towards Sale where he commutes to. So the option of a Torq depends on whether he can avoid hills over 1 in 10, if he can a Torq could be ok, but if he has to ride up 1 in 8 or more, especially long stretches, he'd find it exhausting. I live up a 1 in 8 and being fit am just as happy to ride it on an unassisted bike as with the Torq, since once speed drops below 12 mph the Torq's power vanishes very rapidly due to that gearing. A to B said as much, and have confirmed to me more recently that the production Torq's 58" low gear is much too high for hills in their opinion.
While it would certainly be best for John to try a torq first, for obvious reasons there are very few torq owners living where there's steep hills, so judgement might be difficult.
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