6 month old sleep

So I’m looking for some advice, or to see if there is others in same position as myself.

I have two beautiful girls. One is 2.5yrs and newest edition is now 6months old.

First was formula fed, current baby is exclusively breastfed.

First was sleeping through the night in her own room by 5 months.

Current babe is bedsharing with me and litrelly needs me to get to sleep .. usually boobing.

I’ve chosen to not be as ‘strict’ this time around because I know this baby is my last so in some way I have just decided to go with flow and embrace it as it passes so fast. I also cannot function and look after a toddler and baby without sleep so bedsharing and breastfeeding to sleep has been my safety blanket when it comes to getting some form of sleep!

HOWEVER.. I plan on going back to work in three months. I’m a nurse so night shifts etc is a given and I worry my baby is going to struggle without me. She has only ever slept with me at night in the same bed space and breastfed to sleep since she came back from hospital. She knows nothing else. Dad used to be be able to rock her to sleep but she’s getting bigger and hates being in the cradle hold so it just results in her screaming in his arms till she eventually konks out.

I don’t want to stop bedsharing, her being in bed with me isn’t an issue, I don’t mind it, but she literally feeds pretty much all night. atleast 3 times, but mostly upto 6 times a night, and as much as 8! Any time she wakes she looks for my boob. I guess she’s got a sleep association which does work but long term it just isn’t sustainable. What can I do to change this? I want to keep her in same room as me at least. I did sleep training with my first and I think I’ve been somewhat traumatised by it as i found it really difficult and it fed off my ppd. I’m open to sleep training again but not any CIO. I know there would be some form of crying as she will be learning something new but honestly I just hate the crying so something gentle.

Current routine atm is wake up 6am, she still takes 4 naps a day as they are only 30mins each and she’s in bed for 6-6.30pm. She feeds on demand.

Sorry I’ve completely rambled but any advice would be so much appreciated.