inline switch

I think a 240 volt inline switch will do the same job. It has worked for me on a 12 volt light.

Yes a 240v inline switch will be OK at the few amps that a shower pumps draws.

This one made by HPM and available at electrical and hardware stores is a durable model. Some miniature ones are flimsy.

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You can buy a bedlight switch in a cord from any electrical wholesaler for about $7.
Just crimp connect the cord in and cover with heat shrink tube.
Regards Philip A