Hi there, you could try:
Awake 5
Nap 1.5 hrs @ 7:15 - 8:45 (A = 2 hr 15)
Nap 1.5 hrs @ 11:00 - 12:30 (A = 2 hr 15)
CN 3 - 3:45 (A = 2 hr 30)
Bedtime asleep by 6 (A = 2 hr 15 min)
Now, this means he will likely be up by 5 again. It's what happened to us, we were in an early to bed/early to rise loop for a long time...still kind of are. BUT several things will work in your favour 1) there is a big jump in A time between 5 - 7 mths so you should be able to push him out again soon, even 5-10 mins will help push your day out and 2) this scenario gave us decent nights so Finn woke well-rested and we started counting his crib time as 1/2 A time. So if he was up at 5 we considered him up at 5:15. And the day pushed out from there as well.
It only went wrong for us when he short-napped, or when he fought the CN.
You could also try to limit his first CN to say 20 mins, then do a second short CN of maybe 15 mins at what would be his bedtime, wake him and then put him to bed slightly later in the hopes to reset his body clock a bit. It has been known to work for others. Finn would use that latest CN as part of his night sleep so it never worked for us really. And he really didn't like it when we woke him from what he considered night sleep.
Let's see what Jane's got :-)
Certainly you could see what the folks on EASY have to say. Lots of mums with early wakers over there too.