Sorry I envisioned your issue at the base of the stairs instead of the top. Does the BB die into the wall or door trim? This will take some effort and reworking the trim.
That's a reversal of the common set-up, usually the apron is taller than the BB, I'd consider getting rid of the 1/4rnd and increasing the height of the apron to equal the BB with a strip of mat. It may take some spackle, sanding and a couple coats of paint to hide the splice. Remove and rework the band molding to meet correctly.
Pad the BB out to meet the apron, if it dies into door trim it will be less conspicuous, if it dies into a corner, it can be hidden by the other side of the corner.
Work smart not hard!
Never bite the hand that looks dirty
Last edited by Ghidrah; 06-18-2015 at 01:47 PM.