Did you already notice that your SDcard remains readable everywhere even when you asked to cipher your phone ?
Here is an How-To I wrote to create a luks ciphered container in your SDcard :
It requires to use mke2fs directly on the phone, and then EDS Lite from F-Droid.
When you adopt the SD Card as internal storage it gets encrypted automatically (with dm-crypt). That’s much simpler. 
Incorporating the SD card into Internal Storage has its own set of risks. You have one potential problem less if you can avoid doing that.
I like the idea of being able to tell on which chip my data is, and so knowing what I’ll be able to save from a failling phone 
Another approach is to create backups regularly or to synchronize important data to a PC (e. g via syncthing) - or doing both.
But creating a LUKS container is a creative solution to a real problem. Well done.
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