F Pace spare wheel size ?

[Sev90]

Hi I'm new to F Pace ownership and have recently purchased a 2017 3 litre to replace my R/R sport TDV8. And I'm loving the Jag after nearly 30 years of R/Rovers. But my concern is the lack of spare wheel there are loads of choices but I have 22" rims fitted and none of the 18" or 19" space saver wheels have the same rolling circumference. When imputing the tyre dimensions into a comparison calculator they are massive difference in overall circumference.
The question is how does this affect the all wheel drive system on the F Pace as with the R/rover all 4 corners must be the same size or it buggers up the diffs some how. So what size wheel and tyre is safe to use with 22" rims on the other 3 corners.
I would appreciate any info and feedback as a search of the form has thrown up no info.
Pete.