The first thing I did was try and find a device that could do what I wanted. I found this https://www.digikey.com/product-detail/en/maxlinear-inc/XR28V382IL32-0A-EB/1016-1974-ND/4515332 which should be exactly what I need. Its too much of a device for what I need but It should serve as a proof of concept. I did need to purchase some 2.5mm to 2.0mm pin adapter cables to connect it to my motherboard.

The second thing I found was what I thought was the right pin out for the LPC was incorrect. My manual did not have the pin out but after exhaustive searching I found this.

Once I had it wired up correctly the serial ports were detected!

However they did not function

This is when the fun begins.