Only You Can Save Mankind did actually get a full adaptation... as a stage musical! I know very little about it because it was so long ago and I don't think it's ever been done again.
There are indeed TV shows of Johnny and the Dead and Johnny and the Bomb. I've not watched them, unfortunately. Same goes for Truckers - I know it exists, just never seen it.
Then of course, there's Good Omens, and The Amazing Maurice, two recent adaptations that are very good. And another, which shall not be named, which isn't.