I would think with the larger Swans at least, like the Wally's and other megabuck boats the owners may just say to the yard "Fix it and send me the bill, I'm sailing on Saturday." People that own boats in the stratospheric price ranges are rarely DIY types, they are better off working at their careers and writing checks. There are exceptions but that may eliminate most of the larger ones, leaving an even smaller group to attract.
Swan currently produces only one small affordable boat, the 53. Not sure what the new price is but there is a used model on Yachtworld (2006) for 1.3 million. They range to 115 feet and I guarantee those owners don't do their own maintenance.
If it is the S&S designs that interest you (to me the nicest Swans of all) there is an association.
S&S Swan Association that has a forum as well as a section detailing upgrades with pictures.