Transition from BM to Formula

What's your schedule like? Since day 1 I've pumped and bottle fed BM to baby. I'll be going back to work in a month so I want to transition to formula but I want her to still have BM in the morning and then when I'm home. So currently I pump every 3-5hours during the day, last pump at 11p and then I pump around 5-7a. But I plan on changing.. last pump at 10p and then first pump at 4am. Then baby will have BM at her 630a feeding, formula during the day and then BM when I get home from work. Does this make sense? Does anyone do it? Does anyone's baby do good with both BM and formula? TIA