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IPX4 only protects against splashes, there's still a risk of condensation ingress. I'm not just thinking about the touch aspect but also what effect moisture would have on the switch itself, not everything is manufactured using quality materials, some Chinese items might rot away in a couple of years.
Condensation would come under IPX3 to my mind.
"locations in which sprayed water forms a continuous film on floors and walls" (appx 5)
This is pretty much how condensation behaves, settles on the walls and runs down.
IPX5 withstands hose sprayed water from all directions which would be sufficient to resist water gently running down a wall.
Every item I install outside such as sockets, isolators and switches only has a rating of IPX5, would be rare for me to install a higher rating, yet that is deemed suitable and suffers no ill effects.
Coupled with the OP's stated 3.6m from the bath, I'd have no qualms installing this item in this position. He should still get an electrician to do the work though.