I am sure that Wilson had official orders, which paid his expenses. As a USG bureaucrat for 36 years and one who has dealt with the Agency, I can assure you that his wife is the one who suggested him. That's the way the bureaucracy works. There is no way that he would have been selected for the trip without someone inside putting forth his name. She may not have signed the orders, but she was the determinant influence.
Wilson must have left the State Department under a cloud. He was fairly young, had an ambassadorship under his belt (albeit a small African country) and was Charge' in Baghdad during the invasion of Kuwait, a high profile assignment. Why did he leave after only 22 years and seemingly with more responsible postions ahead? He must have screwed up in his subsequent one year posting to the NSC or more damaging info came to light in terms of the April Glaspie contretemps. She was his boss.
Seems there are many folks who would have known of his credentials for such a trip.
But that's okay. The fact - indisputable fact - of my post above is that someone at the RNC is lying through their teeth about what Wilson said, using one of the most blatant selective edits I have ever seen. Strange that no one here wonders why.