This one, maybe?
http://www.iafd.com/title.rme/title=...omes-twice.htm
I haven't seen it but Uncle Miltie (Michael Morrison) would definitely have been Santa in this one. The scenes list gives him 2 with Susan Hart, which probably means she played Mrs C. VCX product, though, and banned at VEF. (I remember seeing this one in the porn back room at Video Station, back around 1987 or so but I only browsed the box.)