Help with regaining mobility with e-bike or scooter and commute

Recently I have lost some mobility and am not able to walk as far as I used to and it's been a bit depressing. I used to walk everywhere for miles and commute, but I'm much slower and can't go hardly as far due to foot/ankle.

I am thinking of buying and e-scooter or e-bike to help some. And then also to ride to the store in my neighborhood which is side streets mostly.

However, I want to be able to carry it on the train when needed and that was why I was considering a scooter at first like a Segway E3, but I also don't want to die on one either, so not sure if that would be a good choice, as I don't ride the Limes much.

Then I'm thinking of a small ebike like Dahon K-Feather or something, but I would want to lock it somewhere at my destination and walk around and get coffee and stuff without lugging it with me when I don't want to ride, while not getting stolen.

Just looking for advice or recommendations on which you would choose for my situation