I can only address issues related to the re-localization of privately imported automobiles that were originally constructed and configured for the North American market, where there are differences in speedometers, daytime running lights (DRLs), rear turn signal colours, navigation systems, and other features compared to Europe.
Manufacturers often aim to reduce the amount of hardware variations wherever feasible and instead depend on configuration choices that are concealed inside the software. The Xentry diagnostic system conceals these parameters from regular usage. Access to these parameters is contingent upon Mercedes' benevolence. To access them, one must input menu item passwords and possess precise knowledge of the specific bits and/or bytes that need to be modified inside the firmware registers.
An issue that may cause discomfort is the potential for unintentional overwriting of modifications made during a firmware update. According to the most recent information I have, the Xentry system establishes a connection with MB and thereafter prompts the user to provide their account credentials in order to access the maintenance menus. Upon connection to the automobile, it does a check for firmware revisions and any upgrades.
My recommendation: Reach out to an authorised dealer/workshop and politely inquire if they can provide any help. I cannot definitively ascertain if it is feasible to recode your vehicle.