It's barely a stretch. 245 is the legal minimum and 235 is within minimum spec for most tyre manufacturers.
At 9.5+20 of it's low you either have to stretch your tyres or your guards....
Plenty of people have but you would be better going with a higher quality 235/40 if its a street car as it will grip just as well and will be lot easier to fit. Unless you are running 400kw or something crazy