I had issues like this with Charlie. I wanted him to be able to take a bottle of EBM for our wedding. (He was 3 months.)

It took a week of persistence and tears from all of us.

I tried so many different combinations of teats, bottles, temperatures. Different people giving the bottle, different times of day etc.

In thh end, what worked was this:

~ Every day, I tried, with a happy smiley relaxed approach.
~ After the arvo nap seemed to work best: rested but hungry.
~ I sang to distract him so that he was concentrating on my singing not the rubber teat
~ Hotter than I would have expected temp of EBM
~ The teat that eventually was his hands down preference was the Pigeon Peristaltic

Of course, I am not suggesting that this will work for you, but having the persistence, a plan, an a "relaxed happy" but very determined approach might.........?

Good luck!