Transition out of Halo sack

My 4-month-old twins are starting to roll, so I’m thinking about leaving their arms out of the swaddle Velcro wrap. They’ve always been able to worm their arms up to their mouths if they fuss for a while before we catch them, and being able to chew on their fingers prevents them from falling asleep (all we hear are slurps and smacks if we try to pause and see if they’ll put themselves back to sleep). So those of you who had babies grow out of their sleep sack, how did you deal with their distracting hands?