I take care of several disabled relatives. For one, he has grab bars around the tub, and a transfer bench in the tub. He sits his bottom on the edge of the bench then lifts his legs and gets in. However he HAS fallen and gotten hurt, and he transfers from a wheelchair so neither leg works. He replaced the shower head with the kind of shower head that is on the end of a long hose. Handicapped bars are around the tub area. But I must tell you he HAS fallen and had to call an ambulance twice. Once wet and slippery, getting out safely seems to be the hard part.
My mother has a walk in shower with a shower chair and that works much better.
One thing to think about is things change. For example when my relative in a wheelchair, who normally pushes his own wheels, slammed his hand in a door his one injured hand left him incapable of doing anything at all. Since all things are done with his hands, one injured hand incapacitated him.
Let’s say someday you may injure your other foot, sprain your “good” ankle, or come home from surgery. There may be a time, 5 years down the road, where you need a wheelchair temporarily or a walker. A walk-in shower is much easier to handle getting in and out of, and in a future scenario might mean the difference between independent living and needing in-home help.
If you are going to go to the expense of a major remodel, I really think an accessible shower is the way to go. Your mobility needs might change in the future, depending on what life throws at you. If investing a large amount in a remodel I’d take that into consideration. If you ever injure your good leg, you may not be able to walk in to your walk-in tub.