Splicing a lightning cable?
Unlikely as lightning cables have circuitry in them.

If you are just replacing the USB end of the cable it MIGHT work, but it would depend on what kind of circuitry is in the cable and where it is located.

If there is anything beyond a bog-standard USB on one end then probably not, if one end IS just USB then this might work.

If you do it post back to this question with your results.