E.N.
I wish I knew what to tell you about helping him sleep later - early mornings are tough for me! But I did have one thought. Since he still needs a 2 am feeding, I would try feeding him just before you go to bed each night. I did this with my babies and it helped them get through the night (and enabled me to get a full night's sleep without interruption), then they woke at about 6:30/7:00 am (going to bed at 7 pm) and played happily for a little while in their cribs, like your son (they still do this as toddlers). If you try this, and he still wakes around 2 am for another feeding, forget about my advice! But it was a great routine for us, and I told a friend about this who was still waking in the middle of the night with her 9 month old, and it worked for them, too. It might even "re-set" his "clock" and he may sleep a little later in the morning(one could hope!).
He may gradually adjust to sleeping later on his own. Since he is adjusting to longer naps (which is great!), this is a change in his sleep habits, so it may just take him a little bit of time to get settled into this new routine (again, one can hope!)