Trying to understand your question and making the assumption that you are asking if the Alfine hub's rotor will work.
The answer would be yes, any caliper that can properly mount to your frame will work with the rotor attached to the Alfine's hub.
But why use a 10 year old technology that was "just adequate" when it was new?
Brake systems have come a long way since 2012, either mechanical or hydraulic brakes in any of the leading brands are SO much better.
Not going to advertise my personal favorites, but have worked on them all.
In my shop, the BB7 is relegated to kid's bikes and the occasional "free-bike-for-the-indigent."
The only good thing about them is that replacement pads were available even during the worst of the COVID shortage.