Solid Edge How to get Line Colors in Black in a DXF File

A customer needs to save Sheetmetal files as flat as DXF.  In the DXF Options there are only the following colors available: Red, Yellow, Green, Cyan, Blue, Magenta, White. However, since the DXF file will be taken for Laser cut machining, the post process requires that the outer contour is black.

Since the colors cannot be changed, the solution would be to define the color for the Outer Loops - that is the outer Edges of the flattened part - to be White.

Since in Autocad the Background color is normally Black, then it makes sense to set a color to White.  If a DXF File will be imported, whilst the Background is set to "White" instead of  "Black", the color for the Outer Edges will be automatically converted from White to Black, which would be the result the Customer wants.

As an example, here is a flattened sheetmetal part on the left and the imported DXF File on the Right: