Rolf, there are a couple of principals that I hope you understand about wedges/slides, escutcheon plates, and their functions.
Escutcheon plates merely cover the rectangular slot in the stock through which the slide goes. The escutcheons do not support the slides at all...they cover the opening in the stock on both sides, and should be permanently attached to the wood. This can be done using a pair of small steel screws or pins that have teeth cut into them so they only go in once, and never are pulled back out. Escutcheon with screws where the slots are visible look best to me, when the slots are parallel to the bore. One method to install those screws is to gently countersink the escutcheon plate, and turn in the screw until it bottoms, and then file off the head and it's slot so that the countersink retains the plate, but the screw slot is gone. It will appear to be a nail rather than a screw, and on really small escutcheon plates, this looks nice.
The slot in the wood and the loop/tenon in the barrel provide the friction that holds the slide/wedge in place - not the escutcheon plate. The slide should be polished well and case hardened it made of steel or iron. It should be perfectly straight too - no bend to increase tension, like I've seen on some guns that have come through the shop. The slot in the slide must be long enough so that a retaining pin, inserted into a pre-drilled hole right adjacent to the edge of the barrel channel, allows the slide to be withdrawn just far enough past the barrel's loop/tenon to allow the barrel to be lifted out its channel. That's a big sentence. A couple things to consider here. There is not much wood below the barrel channel along the edge because of the shaping of the forearm, so be careful not to drill right out through the stock there. And the slot in the slide should not be visible at its outer end where it protrudes from the forearm. The heads of the slides should be filed so that they lay perfectly flat on the angle of the forearm. I made a jib out of steel so I could forge the heads to the correct angle, and thus reduce the amount of final filing needed.
There's lots more, but I hope this will be of use to you. Nice looking pistol.