The OP asked how to keep brake temperatures down when the approach and landing is normal. The obvious answer is to transfer less energy to brakes by using more reverse and less braking. The rest of the discussion is about how to decrease brake wear and saving on engine maintenance costs. Carbon brakes wear by the number of applications rather than high brake temperatures. Brake wear increases till it reaches a peak temperature and then it rapidly decreases. Airbus document on braking mentions three brake manufacturers BF Goodrich, Messier-Bugatti and Honeywell. They have different peak temperatures. In case of Goodrich it is 80C, Messier-Bugatti it is APPX. 160C and Honeywell 200C. Beyond these brake wear decreases. However as the graph shows the brake wear reaches nearly the same value at about 315C and after that only Goodrich keeps dropping linearly but in case of the other two the brake wear starts to increase. So unless you have Goodrich brakes fitted the least wear would occur around 350C. Depending on the LDA you can achieve these temperatures by using idle reverse and low or medium brake. Auto brake results in single application. Idle reverse saves maintenance costs but finally whether you have brake fans or not and turn around time will govern your decision to use this technique. According to brake manufacturers ideally brake fan should be switched on after 5mts. for thermal equalisation but airbus recommends to put them on when the green arc appears. So take your pick.