TOGA is perhaps a better idea..
TOGA will certainly be an effective method of forcing a GA. But the strong pitch up caused by GA thrust would certainly catch the offending captain completely by surprise. Especially in IMC he may not have a clue what the co-pilot is up to and by the time he twigs to what's happening allow the aircraft to reach an alarmingly high body angles which could lead to a stall which is not what the co-pilot had in mind!! TOGA can be dangerous if unexpected...