Tow bar be available on eBay.au, or Amazon. Everything is possible.
Not legal to fit in UK, as already pointed out. So while yes you could fit it, if ever involved in an accident you would have serious issues.
I'm not so sure about that. Yes, technically, on a car built after <some date> the towbar must be an EU type approved component. That is also true of the car itself, however, and I'd bet that it doesn't have EU type approval, it's been imported and put on the road via the UK's IVA process, most likely.
Now, had the car had a tow bar fitted when it went through IVA I doubt anyone would have batted an eyelid. The inspector would have judged it "equivalent to" an EU type approved towbar (sufficiently strong and properly attached, etc) and the car would be legally towing on the UK roads.
Go into a towbar fitter and they'll probably tell you that they don't have a towbar they can legally supply. Source and fit a towbar yourself and I'm sure you would be fine. You can argue that the car isn't a type approved car, but that it has demonstrated equivalence to the relevant standards.
This is subtly different to chucking a towbar on a UK Monaro / VXR. They are EU type approved vehicles for which an EU type approved towbar fitment is not available, so game over.
Long winded way of explaining what Dr. G has just said. ^