Hi! I did something similar with DD1 but as I couldnt express I just dropped feeds slowly, iirc the morning feed was last to go. As for pumpng at the last feed, maybe if you pump a small amount to avoid engorgement and then slowly pump less and less at that time? As for sleeping longer with formula - it is no guarantee! DD3 is my only ebf baby (older two were fed formula at bedtime and slowly dropped bf's for formula) and she was the earliest to sttn, go figure!