Hi Mileymk6, my main dealer retrofitted Cruise Control on my current 2009 Mk6. A new stalk and some coding as far as I'm aware. Was a while ago though in 2018. The main dealer was Parkway Volkswagen if that helps; not sure if you're in the UK?
As jv says depends on the appetite from garages to do it, but worth an ask.
Bluto