Toasty harnessess also generally mean toasty header pins. Replace both (armed with the proper knowledge and the proper tools) and you will be fine. Once you have this perspective repro harnessess sounds like an excessive idea.

It would be similar to replacing your entir car door if your window up/down was flaky. Yeah, you could do it this way, but why?

Only demand for repro harnesses would be for people building games from scratch. There might be a market for that, but you also need to be building cabs, game specific parts etc...