I have a little boy here who is almost 4 and won't poop in the potty but he's been pee trained for at least a year now. Thankfully, he only poops at night and I haven't seen one in a long, ong time. He's so stubborn but his Mom is trying absolutely everything.

Be careful to buy non-latex gloves by the way because a lot of people have latex allergies and you don't want to run into any problems. I think I'd be buying a mask for that little guy too.