Chicory is probably you're only other good option. If you're going to consider planting both, it will limit what you can spray. Imox (generic raptor) is really you're only affordable option when you mix chicory into your clover. Some guys like clethodim(grass specific) and 2-4DB(broadleaf weeds, NOT 2-4D), but 2-4DB can't be used on chicory. Overseeding something like buckwheat, oats, rye or winter wheat is pretty easy will get you some extra forage. When you mow it, it should die off. In the fall you can overseed brassicas into clover as well. It'll die overwinter, and won't hurt the clover.