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You could replace the whole mess with wireless switches. Turn the switch on permanently and put a wireless receiver where your light is. The switch can be anywhere since it doesn't need wires or power.
https://www.tlc-direct.co.uk/Main_Index/Quinetic/index.html#Quinetic_Controllers
sohi
In your previous post, the second diagram has 3core +earth dropping down to the switch. The extra conductor would make it possible, but without it your stuck.
Smart bulb /motion sensor switched?
Pull through another cable?
Move house?