Typically unusable, but a great idea!
AAC use cases are defeated by UX shortcomings. I very often find that the keyboard cannot find my saved phrases, or it will have some kind of other unresolvable error that impacts functionality. The latest such error is that the entire keyboard is replaced with a message about not being able to use “Media folder’s items”. Which I don’t care about and have never set up. There are no items in the Media Folder at all. So, after accidentally opening the keyboard and seeing this error, I opened the full app and was prompted to review. I cannot recommend this for any serious use cases. To use Media folder's items, iOS need to enable 'Allow Full Access', Settings> General>Keyboard>Keyb oards>LazyBoard>Allow Full Access