No sadly I would have done it differently. In production you bend everything to fit together, choices are and and changed as conditions require rather than deciding to address the connectors after the board is finished. If you expect the wires to move in use then provide for the movement by using one or more of the methods I mentioned. You can buy wire with as many conductors as required If you have a situation that requires that kind of wire then you might re-think what you are doing or order a "custom" cable (expensive for a "One of" type of device or product). The ferrules are very nice but in the long run rather expensive as you must have some kind of crimper to use them or worse tin the wires in production. Soldering or "Tinning" the wire ends is ok IF you have a situation where the wires don't move (Wire clamps) but effectively makes solid wire and worse IF you have "Nicked" a wire or two in stripping the wire you have started the breaking process. I am totally spoiled as I have used strippers that are nick free all my life (They strip Teflon as well as Kevlar easily too) but they are expensive as they are used to strip wires intended for aircraft production... I don't think that the ferrules are the final answer as they only provide an "Interface" rather than a direct solution. If you can immobilize the wires, use the ferrules... they look real nice but they add little to the integrity of the job.
Doc