Hey Sergeant looking good.. the blue dyed grain filler will likely give you a very similar effect as the ebony timbermate. Take a look at my pbh-4 build I did ebony timbermate and stained over it. The flamed maple will not take much if any grain filler because it is a very tight grained veneer, so you won't get the same effect on it. Plus you would have to be very careful sanding back the filler because the veneer is so thin. If you did the dark grain filler I would lightly stain the top with black and rub out with fine sanding pad then put the blue over that. The flames will pick up the blue and between the flames will pick up the dark and make them pop.. watch videos on YouTube from BigDguitars he has lots of good finishing videos with flames and quilted maple tops, but remember he is not using thin veneer so you will need to modify to fit your situation.