I am currently driving a 520D ///M over here in Germany with HUD. I have REVO polarized sunglasses, and I can still see the HUD while using them. It is a little light on the stock setting, but once I turned the brightness up, I could see it without any issues. So, unless they use different glass and reflection in Germany only, polarized sunglasses with brightness adjustment via the iDrive should work.
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