A quick mental calc to keep the max climb torque under control could be to reduce the max torque by about 70ft-lbs per 1000' above sea level, then adjust by +20ft-lbs for every degree Below 29 deg C OAT and -20ft-lbs for every degree over.
Works roughly for the temp ranges and altitudes most of them are flown in Australia (<10000' and 0-40deg C).
Of course you could always tape a copy of the Max Climb Torque graph to the visor and adjust every 1000-2000' ?