I have in the past tried all kinds of "bluevision" style lights to make them look like xenon - and my experience has been very negative - against the crisp white of an LED they still look yellow. I did once buy some Electric Blue bulbs which did actually look like xenons when fitted but they gave off so little light they were almost dangerous on a wet unlit road.
From experience, PIAA Xtreme White Plus bulbs are about as white as you will get - and they put out an awful lot of light (equivalent to 110W) - whilst still being road legal and won't melt your wiring.
If you want to legally match the colour you will need to retro fit xenon headlamps - the complete units including the self levelling motors and power wash nozzles. This won't be cheap - the units are about £350 each side and that doesn't include the washing system & I would imagine an IDS session would be needed to programme the BCM to make them work properly.
Don't be tempted to fit HID bulbs in the existing units - they are illegal and may see your insurance invalidated in the event of an accident.