Breast V bottle


Just looking for opinions here as my midwife seems to have disappeared off the face of the earth and the substitute midwifes I’ve been seeing are useless, I want to bottle feed as I honestly don’t want the stress and comments when out trying to breast feed,plus it’s not something I am confident in doing long term, but after looking into it several people have said I could express and still give via bottle and then combine breast and formula after a few weeks ( making it easier to go back to work and more comfortable with myself) would this work at all or is there a set time I would have to just breast feed before being able to combine the two??