It would probably fit an S or S+ - they come with the old 16" wheels. (AFAIK the newest Leafs also still use the old 17" wheels.) As for whether or not the 16" wheel would work for short distances: maybe, but what if you have to drive much farther than expected with it? What you'd need to do is determine the actual height of that spare, and if it's close to that of the 17" tires, decide if you want to do this experiment...
Brilliant Silver 2021 Leaf SV40 W/ Pro Pilot & Protection
2009 Vectrix VX-1 W/18 Leaf modules, & 2 lithium E-bicycles.
BAFX OBDII Dongle
PLEASE don't PM me with Leaf questions. Just post in the topic that seems most appropriate.