If someone finds your randomized grid yea. the shapes themselves should be low entropy.

Imagine crossing a border with a grid and agents taking a picture of your list. Then after the fact they go home, enter the grid into their AI tool which tries to brute force with human friendly patterns.

Perhaps you have some time to transfer out as long as you arent detained during this period.

128 or 19580 bits of entropy in the grid, so treat it like you would a seed phrase. With 128 bit, you can regenerate using a 12-word regeneration mnemonic which works exactly the same as a seed phrase - do can be used as a decoy too. It is designed to prevent evil maid, border guard and Elizabeth Warren attacks.