Last year when I was searching for a clutch set, the release bearing was unavailable. Leftover items were sold on eBay around 500 EUR. Pressure plate and disk was still available. I bought the CO.ME set because the parts of it cannot be mixed with the Sachs parts.
I was looking into the situation again over the weekend and the good news is that the release bearing has been remanufactured with a new part number: Sachs 3151 600 781. Still sold on crazy prices on eBay, but it's available from online part shops for around 100 EUR. The bad news is that now the pressure plate did become unavailable. Disk is still available, from Sachs Performance too.
Ghibli II and QP 4, maybe Shamal too already had the pull type clutches, release bearing and pressure plate is the same as in 3200 GT, only the disk differs.
I'm also unsure about that upper plate, was thinking about just cutting it off, by the look of it it will anyhow eventually break off
But my plan is now to use the original Sachs set. A new bearing is already on the way, and I'm going for an overhaul for the other two parts with factory parts. Disk to be relined with new springs, pressure plate at least skimmed.