Do you want to cut the letter to a depth, or cut all the way through your material? If cutting all the way through, can't you just cut the letter outline instead of using the fill with the outline? If that's not possible with VCP, try using the J-Tech extension for Inkscape. Inkscape will trace the outline of a raster image letter and the trace will be a vector for cutting. Sorry for the lack of knowledge with VCP as I use Kubotek KeyCreator for my Cad/Cam vector laser cutting needs. https://jtechphotonics.com/?page_id=2012
Now if you want to cut the letter to a depth, our image to gcode programs can generate the gcode for that to be done without any outline cuts.