I used to do this but I found it downloads needed language files in the background. So every time it updated, I would clear all the app data, open it again on something innocuous, like a text file, toggle each language I used. Not knowing how long it would take, I'd wait until each seemed to be behaving, then disable network permission. I still don't trust that it doesn't send data off via Play Services.

Now I use Heliboard with the swiping library added. It's not perfect, but has improved, and at least it can give more than three correction options (long–press centre suggestion with ellipsis below).

I really miss Keymonk — two–finger swiping, accurate, and no crap.