You can have your instrument cluster reverted-back to European spec, this is known as 'Delete UK mod', you can Google it for more info.
But unfortunately it is not a DIY job, because it requires the use of MB STAR Diagnostic Computer, so you'll need to see a dealer or MB Specialist and ask them to do this for you.
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www.comandonline.co.uk can also do this, I suggest you give them a call.