There are an awful lot of threads on other (mainly US) sites where lots of members, and BMW NA, are adamant that it is not possible unless the RDC was in the original build of the bike. This was mainly for F800/650 bikes but one member (who used to frequent this site) was having trouble getting it to work on a K1200S.
In USA, they sell an aftemarket kit of all the bits you need, but even having purchased the kit, the mothership won't allow the computer to register the option. This was as of 2014.
I don't know if this is different for Europe, but unless anyone has actually done it successfully, I wouldn't spend money speculatively.
Brian (who thinks caveat emptor is most appropriate in this case)