I'm totally up for 47 having his heart frozen! Assuming that they get to remember their frozen heart experiences when they get better, it'll teach him a lot about himself (OMG, he had a heart to freeze in the first place? WTF???) once he gets better.

He's got some paternal instincts on him he'll never admit/isn't really aware of, so I could have him try to Dad at Winter during that time, or whatever role you think suits him.