Add cruise control?

Anyone know if it’s possible to add cruise control? Got an aftermarket headunit but don’t have the wires to make it so I can use the steering wheel controls(not really bothered about them), so I was wondering if it’s possible to add cruise control to the car using the steering wheel controls for the radio?

If so would it be a fairly easy job or a bit of a pain to do?

Found this for an NA, perhaps the same will be available for your car?