Who said anything about smoking hot brakes?
I did! (sarcastically) But there is little doubt that the brakes will be some amount hotter after takeoff than they would have been without riding them on the taxi to the runway.
To me, the idea of riding the brakes with the thrust levers pushed up so as to burn off additional fuel seems unreasonable. I would be much more supportive of just taking a short delay to burn the extra fuel while stopped. While it might have very little effect upon actual aircraft performance, taking off when you know you are above the calculated limiting weight is practically indefensible from a regulatory viewpoint. In my experience, small amounts over various limits sometimes go "unnoticed" for this reason. Most of the time it doesn't make any difference, but once in awhile...