Factory terminals to re-pin connectors?

Okay. I do have a de-pinning tool for Deutsche connectors I believe that can probably do the same function. Essentially just a narrow flat head screwdriver. And I actually have flat in-line connectors on my dash panel as opposed to a round one, but I imagine they use the same style pins. Again, they aren't actually bad, but I'd rather not cut them off the old harness if I can source them somewhere else. The idea would be to have two complete harnesses when I'm done, one factory one and one brand new one that will replace the factory one with extra circuits for my fuel injection system and other additions.