Tool for kill switches

[wibble]

But I do wonder about the life cycle of the switches themselves, if you toggle them on/off 50 times a day, ?  How many years will the switches last ?

DIP switches aren't usually designed for a large number of cycles. You'd need to find the part used and check its datasheet, but you can get an idea of the likely range by checking the 'Mechanical life' filter here:
https://uk.rs-online.com/web/c/switches/...-switches/
At that rate you'd be lucky to get a year, and it could be MUCH less.