Well if he has been living with no heat he certainly can be immunocompromised. As soon as you can get the uth be sure to purchase a thermostat to regulate the heat off the uth. That is critically important. The areas pictured on the snake surely look suspicious for scale rot. I would alternate with the betadine and polysporin. Be sure to switch to paper towels so you can monitor the scale condition. As long as he has fresh drinking water I wouldn't worry about him feeding right now. The aggressive rewarming over time should help with his overall health and well being. The paper towels should remain in place as his primary substrate.