Crib sleeping

My son is 3 1/2 months old He has always slept either on my chest or in a sleep and play coast sleeper right beside my bed which has vibration and music it’s a slightly inclined and more nestled so he probably feels like he’s being held in a way. He’s outgrowing it because he would wiggle himself down to where his legs would be up higher than his head and tried to twist almost on his side. Anyway I’m trying to get him used to sleeping in a crib I have a portable crib on wheels which I put next to my bed and attach the vibration and music to. I have one of those washable incline pillows that I’m trying to use as well since he has acid reflex and I also have the head side on two books to give it some inclined as well. He absolutely hates being in there he won’t sleep in there for longer than about 30 to 45 minutes all night what are some tips or tricks on how to get your child to sleep in a crib. I’m thinking he just doesn’t like to be flat on his back and feeling alone. I do you swaddle him he has the nested been Zen Velcro swaddle which has a little bit of weight to it so they feel like they are being held