I've got it! Maybe they could clone Clark's heart from of the healthy cells still in it so he could be his own heart donor. I know the notes for cloning had been destroyed, but with Clark's eidetic memory, he'd be able to recreate them. Assuming, of course, that he actually really did see them in TOGoM, and assuming that the process would also work on Kryptonians.

I see that part five has dropped. I'm half looking forward to, and half dreading, reading it...

Joy,
Lynn