EBF / returning to work

Hi all! Hope this is the right place to post this. I'm ebf with my first, who turned six months yesterday. In September she will start daycare and I will go back to work. I am a teacher with usually four grade levels and six classes at any given time and while I'll legally get a break, I won't be able to pump.

My question is this, if I have to switch to formula by that time, is it possible to cut down feedings to just breastfeed say twice a day? Before work and before she goes to bed? I'd keep going if it wasn't for work but I'd rather do both than all formula if I can swing it.

Any advice would be appreciated!

Also, any recommendations on formula for anyone who had to supplement /eventually switch over would be helpful too.