I second what @Mariah said
i totally get you, those night pumps can be such a hassle with all the cleaning... i usually just try to keep it simple and wash everything in bulk when i can. here's what the 'Heal Baby Care App' says.... "It's great that you're exploring different feeding options for your baby! Many parents find night pumping challenging due to the cleaning involved. One suggestion is to have a dedicated area for pumping and cleaning, making it more efficient. You might also consider using a hands-free pumping bra to make the process easier while you care for your baby. How often are you currently pumping at night, and do you have a specific routine that you follow?"
Yes, with my son I used formula and breastmilk- if you want to still pump and feed your baby breastmilk as well, you still should pump every 2 hours during the night to keep your supply up, if not it will start to drop. (Tip- after pumping, place the pump parts in a plastic bag and place in fridge until next pump, that way you don’t have to wash the parts after every use)