Have a 2006 X5 3.0i, facelift.

The Passenger Seat Occupancy Sensor has become faulty (had the code checked). There was a recall on this specific issue but lucky me my car isn't covered. Local shop told me $6-700 to replace the sensor. (On the facelift E53 the sensor is built into the seat, need to replace the whole bottom half of the seat). Currently I have the passenger airbag disabled light turned on.

Searched and found this which is supposed to make the computer think there is always a person sitting in the passenger seat, thereby allowing the passenger airbags to work in a collision.
Problem is its not compatible the sensor wire I have under the seat. The maker of that bypass doesn't know how to help me.

Is there anything else out there that I can do to avoid the big repair bill?

Now for pictures:

Wire layout under seat:



The yellow box. Wire bundle comes out of floor into this box. The sensor wire along with those for all the seat control motors feed into the other side:



Seat sensor wires connected



Sensor wire on the sensor side. Any pre-made replacement needs to have this socket:



Sensor wire on the yellow box side. Pointed it at the camera to show number of pins and the shape of the connector: