I would think that if you bound the pieces of LR together with ties and epoxy putty, you would be more than secure for the long run....
Do not use white zip ties they will become brittle and break. Try the black zip ties they are outdoor rated and weather and uv Resistant
we shall see over time , rated for 50lb and 185° temp rating should last a while . and i didnt use just one to secure the rocks . drilled multiple holes in tonga to secure them .Oh crap luna u better swap yours out