Yes, you can do what you want. Do you have a multi meter? (and can you use it
)
DIY three way to two way switch conversion:
Put tape, or a switch guard over the switch behind the refridgerator. You will need to leave it in one permanent position if you are not going to remove it. Turn the light ON at the switch position you want to replace with the WS467. BE CAREFUL TO NOT FLIP THIS SWITCH AGAIN until after we check for continuity between the terminals. Turn off the breaker for the circuit and remove the switch.
This next step is important: note which wire is connected to each of the three screw terminals of the switch before removing the wires. Now use the ohm meter function of the multimeter and ohm between the the terminals of the switch, finding the two terminals which are shorted or have zero ohms between them. Connect the WS467 to the two wires which were connected to those two terminals.
Also important; put a insulating wire nut on the third, now unused wire and re-install the switch. Turn on the breaker - should work (he says confidently).