W210 is too computerized to play with, without having access to custom programming, and the factory programmer (STAR DAS system).

Auto to manual swap will require re-chipping the ECU as KarTek says.

Changing lights from Incandescent to HID will require version coding of the SAM module or else it will throw a bulb out error. This will require Star Das.

An alternative is to pick your target car as a 1995 W124 E300D. You will have the 606 engine (but it will be N/A) however, you will have no computers to mess with.

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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech