Possessing neither the resources or the knowledge of rocket science, Ralph would probably curse his luck for being stuck on the doomed planet. After a bit of sulking, he'd do some asking around and attempt to con his way into a survivalists bomb shelter and hope there'd be some space for his wife as well.
It all depends on the battle and child, but really, he would repeatedly ask himself how on earth he got himself stuck in the middle of another terrible mess and try to find a way out of saving the child and having to get involved in the fight. After all, it's not his child.
His ultimate goal is so self involved, he wouldn't take the opportunity. Although, if by luck, he had saved the child in the previous battle, he would send it through with very specific instructions to save his hide from the asteroid.
Of the senses, I think he'd regret losing his sense of touch the most. His work is very hands on and most of the runes required for it he had memorized to the point he could do many in the dark.
I think that he'd be in a state of shock. Not from moral dilemma. No reason for someone to die unless it was part of his plan and no plan of his require such direct contact. The shock would be his success since he has almost no training in the defensive arts or weapons training outside of alchemy.
Anything his wife cooks for him. Nothing relieves his stress like a good, home cooked meal. Of course, he might not like it so much if he knew she was secretly an assassin and quite good with poisons.
My question: What is your characters view on organized religion?