If I can't leave a circuit or the part of it I've worked on fully compliant with regs when I've finished my work then I walk away.
I'm not in the habit of doing favours and bodging non-compliant installations for the benifit of my customers. It WILL come back to bite you.
Am I going to risk my registration and my reputation, even my freedom just so you don't have to make your electrics safe? Am I heckers like.
Very commendable of course.
But just supposing there was a house with the switch wiring exactly as described. And one of the switches was broken. And the customer (a very old lady for arguments sake) wants the switch replaced (a plastic one will do) so she can see what she's doing.
What would be the right thing to do here?
Changing a damaged switch is different to swapping a load of fronts from white to fancy chrome.
Changing a damaged switch is maintenance. Swapping a load for chrome is not.