I think most all snakes are cute, & lined snakes are no 'exception'.I've raised lots of neonate & hatchling snakes, they love "shredded & tossed" paper towels, it's easy for them to move thru yet feel hidden, & with a wounded snake, you'll be better able to see what's going on (blood or drainage will show up, as will feces) without it sticking or contaminating his wounds.
Have you tried places that sell bait? (other than pet stores) Depends what's around where you are, there's lots of fishing where I live- near huge lakes & rivers- so bait is a pretty big seller around here. My garden is full of worms too, pity we aren't neighbors. (are we?) I don't exactly know how severely he's injured...he might not eat anything for a while, as he recovers.