If you have a trailer hitch you can backfeed power to the battery from the trailer connector. There is a way to hook the cable on the door handle carrier with a bent piece of wire or push it with a screwdriver I think I might have a video showing how to do that.
I want accidentally locked my key in the car when my drivers door handle carrier was broken and before somebody in Chicago figured out that I gifted them my car I figured out how to break in using a screwdriver by pushing on the cable of the doorhandle carrier. It helped greatly that I have the replacement doorhandle carrier to practice on.


I made a little hook out of some stiff brass wire that I could use to hook on the cable and pool rather than push with a screwdriver as well.

The concept is pushing sideways on the exposed inner part of the cable at the top where it meets the geared lever.

A long thin flat blade screwdriver maybe 3/16 inch wide goes through the hole that the handle comes through and you just need to find that piece of cable and push on it pretty firmly. You may have better luck fashioning a little hook on the end of a piece of stiff wire then wire maybe 1/16 to 3/32 diameter. Hook that wire on the cable and pole instead of push.

__________________
2011 E70 • N55 (me)
2012 E70 • N63 (wife)