I'm sorry I'm way late on this but I have given it some thought. I really like the idea, but I think it would be unworkable and economically unfeasible. Having said that though how about a modified Ready Rig idea. Sell packets with the correct number of eyelets and barrels and pieces of "wire" plus an extra one or two of each by aircraft. So lets say a W.12 would have 3 pieces of "wire", 6 eyelets, and 6 barrels for the float bracing. Or lets say a Pfalz D.III would have maybe 22 pieces of "wire", and then eyelets and barrels plus a couple. Then a person gets what they are looking for in a neat little package and the work load on you would be only marginally more. You could even do cockpit kits. I am sure everyone here would be more than happy to give you parts counts and approximate lengths to make these kits.
Anyways that is just my thoughts on the matter.
James