Today, I got response from SINAR Switzerland, informing me that “it’s not possible to use the p-SLR adapter with other SINAR cameras than the P2 and P3 models. The p-SLR system is being installed on the rear joint unit, fixed with a screw. The SINAR F2 is characterized by the joint unit and the 4×5 inch frame to be permanently connected. The only possibility is to use a P2 or P3 rear element with the rest of the system belonging to the SINAR F series cameras.”
So, it’s not impossible but not just “plug and play” to get the p-SLR system working with the older SINAR viewcameras. In addition the need of a P2/P3 rear element adds another estimated 500 Eur to the total investment.