I know that on the e46zone a UK based member has had a modified s50 based header made up (so with a custom m54 flange):
http://www.e46zone.com/forum/topic/37488-cannockwolfs-sc-330ci-lsb-in-winter-mode/?do=findComment&comment=732487
And maybe ask schmiedmann if they already do a RHD set for the e46. If they do, it could be adapted to the e85 with minor welding.