What is not clear to me is how you handle that when climbing and passing lets say 10.000
Fly 5° pitch, the thrust is in CLB. After that pull out QRH. Take any altitude above MSA and level out using GPS altitude and using the thrust given in QRH. First maintain altitude then check attitude and adjust thrust as required to get correct attitude. No need to tax the memory. Airbus has now come out with Digital Back Up Speed or the D BUS. Now it's ECAM action.