I doubt that any of these will work (Especially since I keep getting the wrong colors), but I tried some quick ideas. http://warlight.net/SinglePlayer?PreviewMap=30393
1 (Bottom-right): Just copy-paste the territories over.
2 (Top-right: Copy-paste the territories, but modify them to put an arrow at the end.
3 (Middle-left): Copy-paste the territories, but use Path->Difference to put an arrow in the territory.
4 (Middle-top): Copy-paste the territories, but have them fade away on the sides.
5 (Bottom-left: Just use an arrow.
6 (Original): Just use the yellow lines.
There may be better ideas but that's all I got for now (especially since I have to re-set all the centerpoints since I had to adjust the map size.)