This is more about the metal than the method. Brass trifurcons will be as bad - or worse - than the IDC connectors.

To do better, you MUST USE phosphor bronze trifurcon contacts. If you use brass contacts, your repair will not even be as good as the original IDC. Now, this is tricky because the only supplier who seems to know about this is Ed at GPE. You'll see that he calls out phosphor bronze, the part number, the wiring gauge that they are for, and the spec. If you have trifurcons and the metal seems soft and not very springy - you probably have brass.

Also - you need different parts for 22GA and 18GA wire. Again, Ed is your friend because he stocks both sizes.

Phosphor bronze retains its spring tension, under vibration and temperatures. The high power Panduit IDC connectors also use phosphor bronze. So the connections remain strong and sprung mechanically, and you get the extended life you expect.

Plus, the usual reminder to replace the headers as well. Putting any new connector on an old header is a recipe for future trouble.