I believe the clutch can be changed without changing the flywheel, but the dual mass flywheels have a bit of a reputation for being problematic and after a bit more conversation with him I find that the car might see some track time along the way and so getting rid of the dual mass flywheel would be a good idea. I think having a normal or one piece lightweight flywheel will be considered a plus on resale. Also the dual mass flywheels are not supposed to be resurfacable.
I am told though, that my favorite machinist has developed a way to resurface them. (not surprising).
Thanks to everybody for their comments.
I will pass along my comments to my SIL and daughter and they will do whatever pleases them!
Tom W
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.

[SIGPIC]
..I also have a 427 Cobra replica with an aluminum chassis.