Solo Mom with Baby and 4yr old

I need some advice on how to handle cosleeping with two kids. I’m 30 weeks pregnant with my second and my first will be just a month shy of four when baby joins us.

Because of my husbands job, I’m a solo parent two weeks at a time every month. As you can imagine, sleep is a big concern for me. My almost four year old still loves loves loves sleeping close to me like a tiny barnacle and I don’t want to kick him out just because we have a baby. I am afraid of the baby keeping him awake though, but maybe he’ll adjust?

How would you prepare in this situation? Assume any bed configuration is possible, we have plenty of rooms and beds. Current plan is a floor bed with bedside crib, with me in the middle of both kids. I plan on attempting to have the newborn sleep in the bassinet at least at fist unless it’s making me too sleep deprived to function- but I’m still stressed!

Anyone in a similar situation? How are you all surviving?