I would skip f/t and go live, like brc said. A moving, constantly warm little prey that leaves an odor as it wanders (urinate) around the enclosure may be more enticing, especially when you can leave it alone to do its thing. Are you following Deb's sticky about difficult feeders?
I would go complete darkness and no red light. Least amount of foot traffic, quiet corner with the least amount of light.
55 grams is such a small little noodle. I am genuinely afraid for that little bugger too. But I don't know if it is time to assist feed or not, the more experienced keepers will advice.
I am thankful for your good intentions, but I hope by you adopting him, the person who gave him to you agreed not to bring in anymore new snakes. I see too many posters of bad owners rehoming their pets (usually sick) so they can pass on their problems to someone else and get a new snake.