How to transition wood flooring into a step-down area?

I just installed a click-lock floating floor in my living room, but I'm not sure what transition to use for an unusual feature. My living room has a small section near the fireplace (about 12' x 10') that is 6" lower than the rest of the room. I installed the flooring up to the edge of the upper level and the edge of the lower level (minus expansion gap) and plan to cover the riser by glueing flooring boards horizontally to it. My question is: what transition pieces should I use to transition from the upper flooring to the riser? A regular bullnose transition is not tall enough to hide the gap between the upper flooring and the top of the board that I will glue to the riser. I was thinking of an "L" shaped piece to cover the gap, but I haven't seen this type of transition for sale anywhere. I would prefer a wood transition that matches my carbonized bamboo floor, but other materials might be OK. Your ideas are appreciated!