I'm with Zen. If your son is accelerated, why not allocate a predetermined time to entrepreneurship with the aim of still attending university. Your marginal cost as parents would be pretty negligible. IMHO, having some real-world experience before university will make your son's studies more valuable to him because he'll already have a mental model of at least one industry that interests him and personal experience to leverage on the other side of his degree.
Also, at no future point in time will your son's ability to withstand risk and uncertainty be greater.
