I'm in the same situation yabiss!
I work mostly in ableton (and use it extensively for live performance) and have been using iOS alchemy on my old iphone going through my audio interface.
I've tried routing the new alchemy in logic into live using loopback but it's still clumsy and requires me creating an aggregate device if I want to use live mics as well. I'm always a little concerned about stability and artifacts with the aggregate device...
It would be much better to just have the OSX alchemy plugged directly into live.
Did you get it working?
Blessings,
Tyler