Hi there! If you can absolutely avoid it, I'd try to skip the cold turkey route -- it really is so traumatic for your LO...and for you as well.
However, it does sound like you really do need your LO to take a bottle! When my oldest was needing to take a bottle, we would try it in a very low pressure situation before each feed - I would just offer it (preferably before she became hysterically hungry, thank goodness for EASY) and if she didn't take it, I wouldn't worry about it, put the bottle away, and try again next time. You only need to put an ounce or so in the bottle (you could even use formula) because he probably won't end up taking it anyway.
![Roll Eyes ::)](https://smiley.babywhispererforums.com/Smileys/classic/rolleyes.gif)
However, with my oldest, she eventually did start taking the bottle and we never had trouble with it again. A friend of mine had an EBF baby who also wouldn't take a bottle - and after a few days of refusing at daycare, he did eventually take it. It kind of also depends on how your mom will cope with the screaming baby (if he's still not taking it at that point). If she's good with being able to wait it out and ignore him being upset, it's pretty much like doing cold turkey then, as opposed to now. Not to say that you can't do it at all, but there are a lot of reasons why you might want to try something else instead.
Here are some tips from LLL for encouraging your baby to take a bottle.
https://www.llli.org/faq/bottle.html((((hugs)))), this definitely isn't easy.