It's a bit questionable if the relationship is one way, but it could be designed to be a symmetric "best" for the companion too. Okay, more CPU cycles, but this reeks of hard take-off, which probably means new physics...

Also, a bit more technically but I hope worth adding - if the companion already exists in any possible world, the fact that you engineer a situation where you are able to perceive one another isn't creating a pattern ex nihilo, it's discovering one. Takes some of the wind out of the argument, although you still certainly have a point on privacy if the relationship is asymmetric.