Its easier for a camel to pass through the eye of a needle than it is for a rich man to enter the kingdom of heaven.
Of course they can be pencil or stave shaped (take out the pith).
So a chaos magic implementation of written rice words to make a spell. Inside the ogham and after the sap has gone throw ogham in running water.
The sap free wood will absorb the water and wash off the spell words…!