I know keeping the plant out of reach is important but could I make a diluted solution of scents that a cat doesn't like and spray on the leaves?
use something hot, like tabasco sauce, and spray around the pot, outside faces of the pot, floor around the pot, do not let the spray touch flower or soil. Also what i know from net, citrus smells should repelle the cat from the plant, mix lemon or orange, again i'm not sure if you can spray it directly on the plant, but spray it around the pot. some fence around the plant, try maybe tomato fence And if that doesn't help I suggest this.