Not all 5 studs have a 114mm dia pitch to match Nissan (but a lot do)
I have a space saver in my Merc but it's 112mm pitch, so I assume it wont fit.
If you weren't too worried about boot space, I'd be tempted to buy another full size alloy. I doubt it would cost much more, and would be much more useful.
There's actually two sets of new Juke alloys already on eBay. Someone only wants £500 for a full set of new 17" sport wheels, with unused Bridgestone tyres. The tyres alone would cost more. What not buy and sell the other 3 to forum members for £150 each, and you've got yourself a bargain spare!