Michael,
Very curious that they were still extending the wraps over the bridge in 1869. Montal said he pioneered soldering the ends of the wrap to the core in the 1840s, and by the time he wrote his 1865 edition, makers were either doing that or some alternate. I'm not sure I would bother replicating that feature, but Gregor will duplicate very well. The felt was probably to keep the wrap from buzzing against the bridge pins. That was a real issue according to the testimony of Montal and others. Also, when you are trying to bring them up to tension, the wraps don't really want to slide past the bridge pins. What's going to happen?
I believe the wrest pins are held by friction in the wood, and are threaded and screwed only on the top cm or so of the thickness of the plate webbing, so you could tap them in until the threads are about to touch the plate. The purpose, as I understand it, was to support the pin and protect the block against strain. The pin is held against the tension of the string by the friction in the block (meaning that if it is loose, there is little to be done - I suppose you could remove the pin, put a shim in the wood hole, pound the pin so it catches the shim, screw the rest of the way, replace coil on pin. Or, instead of a shim, you could swab some CA in the wood, taking care not to get any on the plate screws).
In stringing, I would have the pins installed already, and make coils on a dummy pin and transfer them. Making neat coils while turning the pin in the block is possible, but pretty troublesome. But I am very used to restringing with pins in place (the original ones), so it doesn't bother me.
Iron covering was fairly common, mostly to make the bass strings less apt to go out of tune with the plain wires when temperature changed. That was pioneered by Érard by the late 1820s. While there is some tonal difference, that wasn't the purpose.
Regards,
Fred Sturm
"Travel is fatal to prejudice, bigotry, and narrow-mindedness." Twain