This is how I handled mine

/micon "Cleric Stance"
/hotbar action "Stone II" #X #X
/hotbar action "Stone III" #X #X
/ac "Cleric Stance"

so I actually made it so whenever I hit cleric stance, it will change the spell that is in the hotbar slot. I only put Stone II and III there cus I use Stone I for the Heavy while out in the world so I just leave it on my bar at all times. If you don't use it like me you can just add the line /hotbar action "Stone II" #X #X (where the first X is the hotbar and the second X is the key number you want to use) to the macro before Stone II and it should be good to go. The game doesn't add skills to the bar that are not available currently, so when you are level synced, this macro will always have your highest Stone on that spot. Haven't had any issues so far other than my chat getting error messages every time I hit the macro because of skills not being available. But that's easily ignored or fixed in the settings. Hope that helps.