I bought a second hand bath lift for my husband - similar to the Bellavita one available at Argos.
If your husband can transfer from a chair to a bed, this will work. It lifts into the bath, secured by rubber suckers, and you raise the seat to the level of the top of the bath. Person transfers their derrière onto the lift, then swing legs over side of bath into the water. Next, use remote to lower lift, which also reclines as it lowers. Bather ends up semi-reclined. Reverse process to get out.
My husband loved it after we had both endured 6 months of washing him with a bucket of warm water until we moved house.
I suppose you could leave it in the bath for everyone to use, but I used to put it in & take it out. Not heavy, but a bit awkward to manoeuvre and you need somewhere to store it.