From Airbus Safety First July 2011.
9. Acceleration Altitude RAPID ALT* ENGAGEMENT – WITH AUTOPILOT In the event of an early capture of altitude (ALT*), for example if the Go Around is initiated close to the altitude selected on the Flight Control Unit (FCU) or in case of a high rate of climb, rapid acceleration towards a potential overspeed may occur.
As soon as ALT* engages, the autopilot lowers the aircraft pitch and the aircraft accelerates without any A/THR protections (A/THR blue). At that time, “LVR CLB” flashes on the FMA. The PF reacts by setting the thrust levers from TOGA detent to CL detent, without delay, in order to activate the A/THR, thus enabling A/THR protections. These protections include a flap overspeed protection.
That is all the manufacturer says and if you have already brought the thrust levers to climb the protection is assured. There is no need to do any thing non standard.