You could still use those routines, use the timings from the wake up time that suits your family.
To get a 4 hour EASY you just need to push the afternoon feed a bit and not feed at 6.30, so instead of 3.40 I would feed at 4/ 4.15 and then just before sleep. Those timings fit in with the naps you have.
If you want to keep the 5am feed, that's up to you but don't expect her to take a full feed less than 4 hours from that feed. Keep an eye on how much solids she has as things like rice cereal are pretty empty calories but can fill them up too much so they get less calories from their milk. Solids now are just for tastes and textures, not to replace any milk.
Your A times are on the short side for her age too, so you may want to think about moving her towards 2.5 hours which will make your catnap shorter as you work towards dropping it. The catnap is only supposed to be about 40 mins, it's meant to tide them over to bedtime so as yours is just over an hour, if you stretch the A times you have the scope for a shorter catnap. You may find that if the A times increase she sleeps through that 5am feed time by herself.
Laura