This guy wants to do that same thing:

Climate control conversion to euro version anyone 300te - Benzworld.org - Mercedes-Benz Discussion Forum

However, he has a donor car with the complete manual system, and "all" he has to do is transplant it.

You have to order all those parts, presumably using the EPC but without the euro Climate Control service manual.

That is going to be difficult, but post pics as you work through the project!