F31 Tow Bar?

[Till135]

I'm looking to have a towbar fitted to my LCI 335d MSport Touring F31. Can anyone suggest the most descreet one? I'm due to have a witter bar with removable swan neck in the new year but I am worried about the amount of the plate that may be visible when the bar isn't on. It will be used for cycle racks etc not towing a caravan!
Any help or photos with one in place would be really useful

[Till135]

My understanding is that the OEM towbar can be retrofitted but is v expensive (over £1000 as opposed to £520 for Witter)
Unless anyone knows differently?