As suggested David if the switch is there its not a dummy so potentially could be re-purposed. On later models such logic latching switches have four connections as shown below. I believe the later versions of 2006 to 2014 trads employed similar.
![[Linked Image]](https://i.imgur.com/73AieBt.jpg)
The connections correspond to two main contacts and internal LED illumination dim or full brighness, the latter to indicate the selection is active. The problem is, from a mechanical point of view, they have only momentary contacts with the latching on or off performed by external circuitry which adds a whole level of extra complexity unless you can delve into your existing PCB and re-employ the circuitry the switch currently controls. Four the record the simplest single button non IC latching system requires four relays!
