1. It's your's and, especially, your bride-to-be's wedding. Wear whatever you want. There are no fashion police who will give you a ticket for wearing a "regular" tie with a PC. In future years your wedding pictures will look just as lovely and invoke the same sentimental memories "cum or sans" the bow tie.
Yes, but it's also entirely possible that one day he will come to appreciate the proper rules of men's wear, and will then be embarrassed to look at his wedding photos. There are a lot of guys out there who got married in their kilts, not knowing (or not caring) if they were "doing it right", only to look back later and cringe at what they were wearing in their wedding photos. So for that reason, I'd really recommend being as correct and appropriate as possible.