See the website linked from the app (https://android.onse.fi/finqwerty/) for layout charts. Suggestions, bugreports and device requests are welcome. Additional custom layouts for your specific needs can be added on request.
BlackBerry KEYone layouts are also available but only work on Android 7.1, not on Android 8 Oreo.
Source code is available and issues can be opened at GitHub: https://github.com/anssih/finqwerty