Sir or Madame,
While I applaud your rescue work, I must inform you that your Vet is either very uninformed about snakes, or is ignorant, or both. We have long known that while Neosporin will work in a pinch, it can actually cause damage if used long term. Betadine solution is really the best thing for a situation like this.
Also, a wound that goes down to and exposes muscle is not going to be good as new in a few sheds, or after 1000 sheds. That scar will continue to be there for the life of the animal.