Use black kandy toner in intercoat clear.... scuff up with 800 then do as many light even coats as you like to achieve the shade you want. Then clear with a proper 2k catalyzed clear. Using basecoat, even overreduced base will reduce the light output greatly for the same shade as the kandy toned clear basecoat.
i only put a few drops of paint in the clear, so it's bout the same as candy, but any of these ways will work it sounds like to me, also make sure you use adhesion promoter first