Those rubber plug assemblies are not easy to mod. I would suggest cutting-in behind the b-pillar cover, where you're at in the pic. Those plug assemblies can be modded, but you run the risk of destroying the it. If you want to try it, remove the rubber cover by pulling the edges parallel to the body, at the pillar. The edges are tucked under the plug. Be careful not to damage the rubber cover. Once it's pull away, you can inspect the plug assembly for how it detaches from the pillar. The other side of the plug stays on the pillar but can be removed to the inside of the pillar, as it is part of the interior harness. Then you're left with a hole in the pillar. The side of the plug hanging from the door can be pushed back through the door frame. You have to squeeze the cover at the door frame. Make it pop through. The hole should be large enough for the plug, as well. It just a one piece harness assembly for the whole door electrical. Then you're left with a hole in the door frame. It's just a rubber, protective cover for the wires to the plug. When you're ready to put it back together, pull the pillar plug out through the pillar hole, reattach the plugs together, pull the rubber seal around the backside of the pillar plug and reinsert the assembly back into the pillar. It will snap into place and seal against the body. I hope that all makes sense to you without having to disassemble it for clarity. If you're careful and pay attention, it can be modded properly.
Addition: Sometimes the plug disconnects from inside the pillar first. The you release the outside plug and seal from the pillar, from the inside of the pillar as well. In this case, to reattach, you insert the outside portion of the plug into the pillar and snap into place. You have to press really hard sometimes. Then insert the inside portion of the plug.
Addition: Sometimes the plug disconnects from inside the pillar first. The you release the outside plug and seal from the pillar, from the inside of the pillar as well. In this case, to reattach, you insert the outside portion of the plug into the pillar and snap into place. You have to press really hard sometimes. Then insert the inside portion of the plug.
