If you write the seed phrase in a special book and are afraid other people can access it, you can use tricks like changing 1 or 2 positions of the words.
"What was it? Changing 3rd and 4th or it was 4th an 5th? "
"Oh no, both are invalid!"
"Maybe it was the 7th and 9th word!? No, empty wallet as well"
"Yeah, now I do remember! I decided to change one word with the preceding one! Or was it changing the second word with a word 2 down in the list? Was it 2 up?
TL,DR: Don't be your worst enemy. KISS principle is the way.