First, I think that all in all his A time needs to be a bit higher than it is now. In the morning it looks ok, but 1h A time at his age is not enough for him anymore.
I think what you could do is on those three days that you want him to be out and awake around 13 is to offer a CN before you want him to be awake.
For example:
7WU
9-10:30 S
10:30-12 A
12-12:45 S
And then go to the pool.
It's not great, yeah? but it's the only way I can think how it can work for you right now. Within time his A times will stretch anyway and naps will be in different times than they are now.
Actually I have another idea. You could offer the CN earlier in the morning, like 1-1.5h after waking up and only let him nap very short, like 30min and then have the next nap after 1.5-2h A time and aim for it to be long. But I'd only do that if the first option doesn't work.
I would also try and make sure that the rest of the days you are at home and offering him enough day sleep to catch up.
What do you think?