I wouldn't use a hammer and chisel, too easy to cut a gouge into the sapwood below the bark.
I made a mistake and cut a pile of hickory past the mid summer, the bark was not slipping off easily, I got out my drawknife and started slicing, when I got down to the cambium layer I draw knifed most of it off until the sapwood back was peaking out in a few places. I use a scraper to carefully remove cambium to expose the back.
I had 17 staves, it took me two weeks to get them all down to the pristine back, I chased the grain on a few that I had violated the grain on.