Convert external keyboard connection from USB to FFC

If it's a typical laptop keyboard with a multi-way connection, then all the electronics are on the motherboard and the keyboard itself just contains a matrix of switches.

This is the keyboard connection on one model of Pavilion keyboard (it's a long running series of computers):


You would have to reverse engineer the keyboard wiring matrix of an original keyboard, then totally rewire the USB keyboard switches to the same matrix, and connect to a suitable multi-way cable tail...

It's a lot, lot easier to get a proper keyboard from someone scrapping a similar machine!
Or just use it via USB?