Hello and welcome to BW
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EASY is absolutely flexible to your family and LOs needs, that's why we like it.
I see from your post you are aiming for the 4hr EASY because your LO is 4 months old. The first thing I would be flexible on is the E times. It takes a while to read through the book and all the various info but somewhere along the line Tracy did mention that some babies can't stretch to 4hrly E until more like 6 months (prem babies, some BF babies, small babies with small tummies for example). If your DD needs to eat more frequently than every 4 hrs this is totally fine. My own DS needed milk every 3hrs until he was 6 months old when he naturally extended his E time himself (and because he had solids between which helped him extend to 4 hrly milk). You probably read about not letting a LO 'snack' but a regular routine of say 3hrly E is fine, BW is not about leaving baby hungry.
So, if you need to feed more frequently you'll wonder how the rest of the routine fits in because you still need a reasonable length A time and a good length nap. It's not a hard and fast rule that LOs eat the moment they wake and it is possible to work out a suitable sleep routine to include the shorter E times (just leave a little A of a few mins between E and S to avoid a feed to sleep prop).
It would also be fine to shift the routine to 8-8 if that suits your family. I would probably do the DF at about 10.30/11 anyway (roughly 3hrs from last E time) but you can try 12.
From what I understand the reason for not doing the DF past 11pm is because you want the shorter night sleep to come before you go to bed, and the longer stretch to come after you've gone to bed to give you the best sleep possible. If LO is fed at 7pm and then at 12 the long sleep might be coming in that first stretch (5hrs is considered sleeping through the night) which would then mean 3 or 4hrly E following the DF. There might also be something to do with babies natural sleep rhythms but tbh whilst I would be respectful of LOs need to sleep and have routine I would also highly rate bonding time with Daddy. It's about a balance. If your LO does better on the shorter E times then a 7.30pm BT feed followed by a 10.30 DF would be fine.
Did you read the section on observing for a few days before you begin? It's really useful, you just write down what happens, what time she wakes, eats, sleeps throughout the day. This will give you a good idea of a suitable routine. And we can always help you out here too.
Hope this helps