There was someone on this forum who had developed the harness for the E70 and it was in the testing phase a couple months back. You could get in touch with them and find out if its ready. To retrofit the Paddles, you will need to purchase a X6 steering wheel of your choice and airbag if needed to use along with the harness.
http://www.xoutpost.com/x5-e70-forum/...installed.html