Ideal switch donor though for an aussie.
Unfortunately, Montereys do not interchange with anything else.
But if you've broken off a few of those from one of yours it could still be useful. Besides, it's now possible to order custom plates made and create cases and then handwire or make PCBs. Why everyone that does that goes with boring cherry switches every single time is beyond me though.
Other than that, they are just Alps-mount. I don't expect that finding serviceable keys would be very difficult. The cable wouldn't be super hard to replace either. If you lived there that's a good price on it, people keep trying to charge alot more for them.