Hmm... Well the reason I suggested a PS/2 connector/converter is because that way (as long as your machine has PS/2 ports, you can find them usually located at the top of the I/O panel at the back of the machine) you can avoid using the USB Bus altogether. They look like this and you may even have one kicking around the house:
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Once you gain access you could always roll back the USB driver and go back to using the KB and mouse via USB.