Can't ever have a gloomy perspective with Xenon headlights fitted???... sadly my gloomy perspective was validated - it failed! ...
Thanks for the update though. Confirmed everyone's suspicions perhaps? Including your own. Dealer perhaps has less experience on this aspect than you do yourself?
Do you also still need to go ahead with the rear fog light swap over as well? Would your DIY theory work? Run a wire from one side cluster to the other perhaps? If you also removed the right side high intensity bulb? That should give almost the same current draw that the lighting computer is expecting? Sounds like that's all the dealer is going to do?
Just out of interest, how much (cost) were the used LHD light units from the seller in Poland? Don't have to answer. Just nosiness on my part.