Are you eating Greek yoghurt? If yes, add some of it in your cole slow dressing. Also if you can find mayonnaise which is allowed (no forbidden ingredients) or you can make your own at home, this makes cole slaw dressing very yummy and more filling. I ususally use sea salt, EVO, coarse ground pepper, ACV, Greek yoghurt and mayonnaise.
As to other veggies, try to find shredded broccoli, i remember getting it at most large grocery stores in California. It goes great either by itself or mixed with cabbage. You could add some kick by using grated radishes or rutabaga (careful with rutabaga it’s a powerful antifungal!!!).
Hope this helps!