Surely this is the job of the speech and language therapist. maybe someone knows someone who can post some suggestions here. I am not aware that physio is as directly involved in helping with mastication post stroke/head injury, unless in partnership with a speech therapist. You/We need to be very careful with this in relation to aspiration although perhaps using a tilt table for periods of time that are tolerated might be a good place to start.

Do you have a tilt table available?