Hi
Replacing the complete pan head is a factory procedure. I know 2 people who have fitted beam pan heads to super pans. It not easy but if you find a front section with a good pan head on it, it may be the way to go.
Personally I would go with another pan, the chassis number will not be a problem if you have a grinder and welder handy, wink wink.
You may find this article useful.
http://www.clubvw.org.au/pioneering.htm
Steve