By moving the spanwise CP inboard (i.e. outward rotation) the outer wing panels work less hard, and thus the tip vortices are not as strong. Isn't this increased (equivalent) aspect ratio?
If so, and the climb performance is marginal, then outboard prop rotation might give some climb benefit.
Maybe yes, but I suppose that this need to be balanced with an increased rudder deflection (more drag, less Rate of Climb) due again to the greater asymmetry of the outboard-downgoing blade.