You can extract those pins from the edge connector, resolder the wires to them, and return everything back to stock, without needing to buy anything. You'll need an extraction tool (or a correct-sized bobby pin) to remove the pins. But there's just a metal locking tab inside the connector that prevents each contact from backing out. You just need a tool to bend that tab in, and the pin will slide out, and you can solder the wires back to it.
And as wugly said, there's no need to do any 'mods' to these cabs, when you just keep your edge connector clean once every couple of years by hitting it with a fiberglass pen. But that's only for running original game boards. If you're using the P4, it's even less of an issue, as that board won't draw anywhere near what the original game boards draw. And it's the high current combined with the slow oxidation of the fingers on the game board that causes the fingers to burn up after several years if they are never cleaned. But if you just clean them once every year or two (which you should be doing to all games anyway, as periodic maintenance), you prevent the problem entirely.
