Hi,
I raised your question, and my comments, on www.DIFFLOCK.com. Got the following reply. I admit surprise that front balls are factory approved.
602
......I have used a front tow ball on various cars over the years, before towing with 4x4's, which sometimes have had fixed front tow balls.
originally the one i had came from my fathers ford sierra estate & was a proper job. (i think it was an option from Ford with diesel engined estates.
the bar fitted behind the front bumper & folded out, allowing you to fit the removable ball.
this same tow bar got used on several various makes of vehicles with a little modification untill its where abouts became forgotten. (i havnt googled it, but similar front tow bars are still available.)
what you do in the privacy of your own land with your ball at the front is your own business. But i would suggest that you do go for a removable ball option for a front fitting.
If you were in a traffic accident & your protruding to the front ball caused extra damage, to person or vehicle, your insurance company may take a dim view. I doubt that they will want to talk about you fitting one & include this in your schedule.
It would also depend on the age of your car, air bag activation, fuel cut out switch etc.
Easiest i would think to have the bar hidden, swing out, & have the detachable ball.