Slow keyboard bus speed down

[Snotface]

Hi

anyone know if it is possible, and has the time and inclination, to build a device that would sit between a PS/2 keyboard port and a keyboard/programmable device, intercept the messages between the two and send them to a serial/usb port, as well as allow me to adjust the bus speed that the connected device would see?

I have an old gaming programmable device that won't work on modern-day keyboard ports, so i need to slow the bus speed down, but i also need to check what messages are being passed to and from the device via the keyboard port.

Obviously, if there is software that would be able to do the same thing, that would be preferable, but i couldn't find anything.

Thanks