Hr19@opm.gov is another viable solution, if not as directly effective.

I stand corrected.

I’ve been using FUTO which is free and open source, has pretty good gesture typing, very good voice to text, and does not connect to the internet. I’m happy with it, but I’m also an idiot and most things make me happy.

Edit: I am wrong about freedom and open source. Don’t listen to me. I still like the keyboard though.