So that would not be a board butter but smth like tung oil?Rosewood is notorious for it's smell, some people love it and others do not. Wipe it down with alcohol like methylated spirits, it removes some of the natural oil from the surface of the timber and will help start to dissipate the scent. It also evaporates and won't do as much damage as soaking it in water. Then oil, something that cures hard will seal in the smell and also stop it transfering to your hands.
Any recommendations that won’t take ages to harden?