The breastfeeding counsellor at Kings, came up with a very practical solution many years ago. I was told to sterilise a bottle top, add the milk and then feed using a small sterilised plastic spoon. A little messy, but it took away a different anxiety that I had. Your partner might like to try this method to begin with. Its quite fun. You will know that the baby can have some milk, if it is wanted then gradually he could try a bottle. It might be good to hold the baby in the same position for both types of feeding so that there is eye contact. Good luck