Loving the discs!
I wouldn't worry about the brakes getting too hot unless you're racing the car (literally -- lapping a road course) or riding the brakes all the way down a mountain. The wheel is open on the inside. I've run 100% discs on all my cars for years with no problems (flatlander in Ontario though).
I made a photoshop of another member's car with discs a while back:
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View my fuel log 2015 Micra S manual: 5.0 L/100 km ... 56.5 mpg (Imp) ... 20.0 km/L ... 47.0 mpg (US) ...