Hi D.,
I can certainly sympathize with you. It may take until he is 2 1/2 to get rid of the pacifier, especially since you have your hands full with a new baby.
Our youngest was full of energy and we would relish those naptimes.
You know your son the best. Does he like recognition (rewards, etc) for jobs well done. If so, go to the dollar store and every time he has a nap and goes without his pacifier, he gets a goody. Another idea is create a chart that he receives a star for going without the pacifier at naptimes, at the end of each week, if he has 5 - 7 stars, take him to his favorite park, or restaurant, etc.
When we relocated to Arizona, on the flight when he was 2 1/2, (he was also a big boy) I let him have it since my husband was not flying with us but staying behind for a few days. Once we got into the terminal, I found the nearest receptacle, casually dropped it in. He was too excited to see his new house, new pool, new room, he collapse in sheer exhaustion and didn't ask for it for days. When he did, we told him it was back at our old house, he didn't ask again. Sometimes, it all comes down to the type of personality of the child. Your son may also still be adjusting to the new baby and want to be like the baby. Good Luck! It's all trial and error sometimes! Take Care.