It doesn't help them sleep, no. My son is fed with expressed milk, and he eats ten times a day at 4 months when not having a spurt - which is on the upper end of feed numbers a bf baby his age would want. He still eats the average amount of bm calculated by weight, Tiktok gave the calculations in one thread and he was bang on it, to the last 10 ml! He feeds usually 4 hours apart at night, though 2 hourly when growth spurts happen. (He also cluster feeds in 60ml every hour or so in the day when having a growth spurt, when his average is 2 hours - I imagine because the instincts remain intact, boob or bottle!)
The primary reason bottle fed babies often go longer is that the milk is so much less digestible. It takes longer to digest, and they poo more out. Unfortunately, this is also why their gut wall is thicker. That slower digestive transit obviously doesn't apply to ebm. The other reason is that there's also more of a temptation when using a bottle to coax the baby to take more at a feed so they go longer, and making them wait for feeds till very hungry. I don't do that, partly because there's a theory that the link with obesity in ff babies isn't down to what's in the milk, but to the baby not learning to regulate his/her own appetite as they would on the breast - eating till full, stopping - and partly because I hate the thought of my baby wanting food, being too small to understand the concept of time/waiting, and just thinking Mum is denying him the boob. The human baby's instinct is surely to cry, be latched, fed. The few minutes wait to warm the bottle (by the time I found out that wasn't needful, he was used it it so it had become needful) is hard enough on him, imo, without him howling and not having any way to know that he'll get fed eventually. I also think babies have tiny tummies, and trying to pack too much in is possibly a recipe for them screaming in discomfort - I mean, I feel pretty crappy after Christmas lunch, myself. My mother used to try to get him to eat lots on the sly, despite my telling her not to (she couldn't bear to pour wasted ebm away, as I am her baby and she saw me having to pump it!) and I caught her out because he used to cry in pain afterwards. Maybe it was just colic - but since she fell into line with the strict demand feeding, the colic's stopped for him.
Expressing is a bloody nightmare, tbh; worthwhile if there's no bf choice, but such a chore. You'd probably still end up with your baby waking twice in the night, but also having to pump (which by definition takes longer than bf, as the letdown is less effective), and sterilise that pump & bottles as well. It's all the work of both methods, if a mother used tetra packed formula. It's certainly no short cut.
Finally - my boy comfort suckles from me when not hungry, so yours will most likely do as well. (I can tell, because when he suckles to feed, it's extremely painful 90% of the time.) He refuses a dummy most of the time, which is frustrating in a bottle-fed baby!
Hope this makes sense - sleep deprivation makes me ramble, sorry!