I hadn't considered this before now, but since Maw is telekinetic, couldn't he simply levitate himself back to the ship, like Leia in The Last Jedi?
I realize much of the collective audience of Infinity War would have groaned had that happened, but in-universe, Maw should have had a dozen seconds (or more) before passing out from anoxia, more than enough time to get his bearings and float back. Now, obviously Stark had began sealing the hull almost immediately after he blew it up and would have likely saw Maw and blasted him a second bunghole the second he got anywhere near the ship. Still, as Maw would have been conscious for a (very) small amount of time after being exposed to space, you'd think he would've tried something.
Same reason Xavier wasn't able to telepathically order those guards to stop gassing him in X2, when he had time to do so.