My solution is a bit of work, but it was rewarding when I did it. I was looking to start learning another language, so I started journal. After about 4 months of 45 minutes a day, I was able to write in a pretty obscure language (in this case Irish) and I had the perfect encryption for my journal.
Google translate is very poor for Irish and since only ~250,000 in the world speak/read it well enough to translate and 90% of those people are on an island it works quite well.
"the process of encoding messages or information in such a way that only authorized parties can read it."
It may not be a secure form of encryption, but it is a form of encryption.
It would be pretty effective against the random passer by, and standard law enforcement would probably not be able to identify the language.
Plus, virtually any encryption a user has can be broken given time and processing power. By hand writing everything in another obscure language, without many native speakers you gain plausible deniability. If he/she manages to get on a list, he/she could claim issues with translation (either by him/her or by the translator).
Google translate is very poor for Irish and since only ~250,000 in the world speak/read it well enough to translate and 90% of those people are on an island it works quite well.