Pumpkin has been napping sooo much better, but is taking longer morning naps, (was one hour, now up to two hours) and shorter afternoon naps (usually about an hour, yesterday 20 min)
Every kids play group is in the morning & it is just generally annoying. Carrot has an afternoon quiet time.
I would let him keep his morning nap, he may be cranky if he doesn't get his longest nap at the time he needs it.
Apple still naps twice a day, her morning nap can last from 1-3.5 hours and her afternoon nap is usually 1-2 hours, she depends on her naps or she becomes a demon child.
If you hang in just a bit longer I bet he will naturally move towards a late morning/afternoon nap time. You could experiment with keeping him up a little longer and see how he handles it. Otherwise,just wait it out. Somehow they all adjust and end up with one good afternoon nap.
My kids dropped their afternoon nap before their AM one. They napped FOREVER around 11/11:30 which was a huge pain because if we were in the car after 10:30, they would conk out and it was so hard to do morning activities. It is a pain, but it is short lived - and in a few years, you'll be wishing for a regular nap time.
I moved Ns last week-ish. It coorisponded with moving him to his own room. He was napping at 830 and 330. Now, most days, he naps 1230-230/330 and goes down easier at night. You could try it and see if he's ready. It took a few cranky days but ohmy it's so much better! Now we have a morning activity and an afternoon activity. So so much better. Before it felt like I was constantly putting him to sleep. The key to our success was getting him out of the house in the morning. Swimming or shopping or visiting my sister. Exciting enough to keep him awake until noon but close enough so he didn't fall asleep in the car. Given his age, I'd say he's probably ready too! Good luck!