I see a lot of guys fiddling with the English RHD seats to make them work - why not just order the the rest-of-Europe LHD parts. If you call the UK shop they will probably order them for you so you don't have to fight through a foreign laguage or you can use this site:
www.bmwetk.com

Part numbers (I translated)

01JCW Sportsitz Leder vorne linksOLD JCW LOGO 52 10 042108119,000 kg€ 1070,0001JCW Sportsitz Alcantara vorne linksOLD JCW LOGO 52 10 042066919,000 kg€ 1105,0001JCW Sportsitz Leder vorne linksNEW JCW LOGO 52 10 044677219,000 kg€ 1105,0401JCW Sportsitz Alcantara vorne linksNEW JCW LOGO 52 10 044677419,000 kg€ 1145,3802JCW Sportsitz Leder vorne rechtsOLD JCW LOGO 52 10 042066819,000 kg€ 1070,0002JCW Sportsitz Alcantara vorne rechtsOLD JCW LOGO 52 10 042067019,000 kg-02JCW Sportsitz Leder vorne rechtsNEW JCW LOGO 52 10 044677319,000 kg€ 1105,0402JCW Sportsitz Alcantara vorne rechtsNEW JCW LOGO 52 10 044677519,000 kg€ 1145,38New logo right side - leather 52 10 0446773
New logo left side - leather 52 10 0446774

New logo right side - alcantara 52 10 0446775
New logo left side - alcantara 52 10 0446774