I just want to welcome you to the forum
@Mjr57 although I doubt I can be of much help.
I worked with children with PPA in special education but have no experience of it with adults.
Language is the most important form of communication and if you can get the help of a speech and language therapist while your husband is in the early stages, they might be able to suggest a workable alternative to use instead of speech and comprehension.
Stay with the forum. There may be someone with experience of PPA in adults who will be able to help.