Seriously, calm doon.
19's will be no issue, just drive to avoid the potholes!!! Its not difficult.
Also, all the specs of the R are known so panicing about offset is a bit silly aswell.
If you really must get some other wheels, don't go buying new wheels from the dealer, thats pretty much the most expensive way to do it! Fitting small alloys with winter tyres will also looks unbelievably crap.
Get some secondhand 18" wheels off ebay, refurbed to black to make mint and fit winter tyres.
But by April it won't be an issue.
My rocco R won't be getting its 19's replaced with 'pot hole wheels' or 'winter wheels'
