I think for safety where you normally attach it with standard fixings I would drill through the wall insert 8mm metal threaded rods and a large washer buried in the wall in the bedroom side,so it cant pull through,then use clear silicone on the back of the basin aswell to stick it to the wall.Damage it kept to a minimum in the bedroom.
Great minds think alike, I've done exactly as you have suggested except I've put thin metal plate on the wall in the bedroom.
I've bolted the plate at the corners through the wall with another 2 bolts through for the sink to mount onto. A little unsightly but it only protrudes 1-2mm and I'll get the bedroom wall skimmed to cover it up! Cheers, Sean.
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