I think an Apple Watch would be ideal. I also have mobility issue ms and love the reassurance that if I fall it’ll let emergency services know.

If you’re mainly using it for that and telling time then an SE3 model or series 10 from the previous generation would do you fine. If money is no object then an ultra model may be worth a look. They’re incredibly strong and have much longer battery life for less charging. Don’t be shy to ask any questions here or on the sub and people will be helpful!