Scott,
I actually experimented with an old cable by cutting off the end, as you suggested. I tried drilling the end of the eyelet.. to no avail..it just won't drill thru. I don't think the cable ends were soldered. From what I can ascertain, they appear to be crimped. I was hoping I could find something identical...or very close, and have them crimped on the shortened cable(s).
I'm guessing that the piece of cable that's still crimped onto the eyelet is just too tough to drill into. Another thought...although kinda cheesy, would be to cut a small section out of the middle and use clamps for outboard marine steering cables to fasten the two pieces together.
I would assume it probably would screw up the paint in those areas.
Another thought might be to cut a slot out of the eyelet(with a cutoff wheel) in order to fit the end of the stripped back cable, and then weld the eyelet to the cable. But, I think the cable core is stainless. I may not have the capability to weld it.
Also as you said, finding the eyelets with the proper dimensions is going to be tough.