I've never tried FBCT but really want to. Seems like it should work. For all images like this, I trace on parchment. Then flip the parchment and go over the outline with tinted piping gel. I then flip the whole thing over onto my cake and the outline (for the most part) is there. Then I outline in black BC and fill in with my colors. A lot of work, I know! Good luck.
FBCT would be the best way to do it. There are FBCT tutorials here on CC do a search to find them