In the space that our claw foot tub was occupying, I mounted a low lip shower surround that measures 60"x36", and has a moveable seat with grap handles. There is so much flat floor space (compared to the small foot area of a tub) that two people can easily/and often do shower together.
https://www.lowes.com/pd/Sterling-Accord-White-4-Piece-Alcove-Shower-Kit-Common-36-in-x-60-in-Actual-36-in-x-60-in/1000074637