I don't know any cryptography but I'm thinking of shuffling the words rather than writing them down in order.
But how you will identify it if you are about to retrieve the wallet? You have to put some hint of doing this. This came to my mind but I'm very easy to forget and my memory doesn't works well now.
I think it would finally be safer to keep digital copies of it. Any suggestions?
Keeping to a laptop that isn't in use anymore and you are the only one that can access that laptop will make it secure. Keeping some back up with a flash drive that's dedicated to be a storage of your private keys only.