TBH, I think Alex is the best man to ask about this, but I don't see why it's not just a matter of changing the connectors. However, you can't buy the connectors on their own, you have to get the whole loom which is quite pricey when all you actually need is one connector from it.
I had a situation where the previous owner had done a botch job repairing the O/S headlamp on my UK, where the ballast had got soaked and it was replaced by one of those chinese HID kits that you can buy for any car. In doing so they chopped off the connector and I had to source a new one from Alex, only to be told I had to buy the whole loom if I wanted to put it back to OEM ballast like it should have been done in the first place. Had to be done though! Infact, it probably cost the previous own more to get this done that to just buy a ballast for £90 online