Physical Therapy Challenges for Bed Bound?

I have an 83 year old grandma at home who is bed bound and we have gotten home PT for about 3 sessions every time she comes back from the hospital (this usually happens every 3-4 months). My mom and I are her primary caregivers but I am in college in a different area most of the time and my mom works full time as a teacher and then comes home for the “second shift”. Basically, I feel that my grandma has not been able to complete her physical therapy exercises that she is assigned (she wants to do them but needs to be reminded) and always needs one of us to make sure that she is completing them properly, but it is hard for one of us to find the time to help her complete them.
I know that there are currently apps that let PTs assign exercises with videos and diagrams on them, and we have tried those, but my grandma is not very tech literate.
I am a biomedical engineering major and was thinking about developing a sort of “wrist watch” that would give voice/haptic feedback to help correct elderly patients when they are doing their assigned exercises. No fancy apple watch situation, just a basic one or two buttons and no website or app. I know that there are AI powered platforms that track motion and can do the same, but I feel that this is not senior friendly in terms of technical skills required. From my perspective this kind of device would help seniors do PT on their own without needing their caregivers to help them and thus take a load off of us.
I don’t know if this is a common problem for any other caregivers, but I would love to know your experiences! Do you guys think this kind of device would help you and your loved ones?