if I write down my wallet seed key out of order, and someone finds it, can they use automation to find correct order and steal my wallet contents?

Let's assume that they don't know the system I used to order them.

Are the permutations of orders of words (further limited by one word being a checksum of sorts) low enough that people could write a program that tries all the valid combinations?

If it is easy to do so, what further steps can I take to further "encrypt" my written down seed key?