Call me a Luddite if you will, but what is wrong with disconnecting the A/P and A/T and hand-flying it to the assigned heading and altitude, calling for flap, gear, altitude select, heading bugs, course bars and navaids as required? Make that co-pilot work! Look after the thrust yourself, as you won't need huge amounts for the small altitude change likely from above 2000 feet to typical missed approach altitude. Re-engage automatics when all settled down.