I'd remove the rear break if i get to "fix" it.
And for the roads, well. The conditions are **** but i do enjoy riding my friends fixie more than any other bike I've ridden even tho its annoying as hell with the bumps and curbs everywhere..

So will that kit work with my wheels without any trouble? I guess worst case i can bring the kit and the bike to the shop and let em do it. Kinda annoys me that the fixie market in Norway is crap..