You could :

Make a macro for the 4 locks and just put on a key you wont spam on locks

/cast [mod:shift] target=lock1 regrowth
/cast [nomod] target=lock1 rejuvenation
/cast [mod:alt] target=lock1 rebirth

and then just make the same changing names for each lock.

This should work fine aslong as you are using the names in the macros