You don't want reverse rims for this, you want Cooper S rims. They are not the same thing contrary to popular belief, there is a lot of confusion about this but the Cooper S rims are designed to keep within the bodyline when fitted over S discs. Having said that, it's unlikely you'll want to use original size tyres so you might still have some tread protruding.
I am aware of the difference in the offset. I just really like the look of the steels with some lip showing![]()
In that case you had better go out and buy some wheel arch extensions of suitable width.