So I had a quick look at swapping over the dual mass flywheel on the V6 to one from an ST200, which I had hoped would fit. Short answer to that is "No".
The ring gear is the wrong pitch, it is thinner (needs shorter bolts), and because it is thinner I don't think the clutch splines will engage properly with the transmission and the clutch bearing will not reach the clutch to disengage it. Scrub that idea
Also no spigot bearing, the dowels to align with the clutch pressure plate are too small... this represents a large amount of work to get it going, and to be frank I don't think I can afford it!