Could Judas have accepted and avoided the prophesied betrayal?
Yes. Judas was not created to be the betrayer and was not left without a choice; he had just as much choice as the other disciples. He had full opportunity to accept, had he wanted to. Yet God's foreknowledge knew what Judas would do when given the opportunity, so prophecy foretold it.
Les explains that Judas had been with the twelve for the whole three years, even serving as treasurer and holding the bag, so he had a part in the ministry. But he never had a spiritual part of it, because Jesus said he was a devil or demon from the beginning. Judas completely fooled the other eleven men, but he never fooled Jesus. People sometimes suggest, “Poor old Judas, he never had a chance; God had already created him to be the betrayer.” Les rejects that. Judas was not put in that kind of situation and was not left without a choice. He had just as much choice as the others, but God in His foreknowledge knew what Judas would do when given the opportunity, and so prophecy foretold it. When prophecy foretells something, it has to happen, otherwise the book becomes a lie. Yet Les insists, never take away Judas’ free will. He had full opportunity of accepting, had he wanted to, but the psalmist foretold that he would betray and fall by transgression. This man purchased the field with the reward of iniquity. When he took his thirty pieces of silver, he took them back to the priest at the temple and threw them at their feet because of his own guilt, and the priest knew it was blood money.