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I believe the 'official' method is to cut out the connectors altogether and directly solder the wires together. People are justifiably paranoid about the possibility of setting off an airbag or pretensioner, but I suspect the risk is only really there if you accidentally short one of the wires to a 12v supply. I'd be prepared to take it on after disconnecting the battery and waiting for a while for any residual voltage to discharge from the system, but if you choose to do likewise then you're on your own.
Keep it simple - cut, solder and insulate one wire at a time to eliminate the chances of getting crossed wires or shorting two together. If you don't know how to solder and don't fancy giving it a go, crimp connectors will probably be just as effective if used properly with a decent crimp tool.
As an added precaution, I'd use a gas soldering iron to prevent the possibility of the circuit being triggered by any residual current from your household mains. It might also be worth eathing yourself to the car body with an anti-static wrist strap.
Currently in Horatio's garage:
2010 Laguna III Initiale.