Prep - Preheat oven to 450°F (230°C). Generously butter 2 rimmed baking sheets with all of the softened butter. Cur butter into thin slices and shortening into ½-inch chunks.
Make Dough - In the bowl of a food processor, add flour, sugar, salt, baking soda, and baking powder. Pulse a few times to thoroughly mix. Add shortening chunks and pulse to break-up. Slowly add butter slices, pulse until batter resembles coarse meal. A few large chunks of butter will remain. Be careful not to overwork the butter or the biscuits will become tough. Put dough into a large bowl and freeze for 15 to 30 minutes. Remove dough from freezer and make a well in the middle. Pour Buttermilk into the well. Add buttermilk and using your hands, fold flour into the buttermilk from the sides until everything is incorporated. The dough should become shaggy and sticky.
Form Biscuits - Generously dust a wide countertop with flour. Turn dough out onto the countertop and dust with flour. Press dough into a ¼-inch rectangle. Fold the dough rectangle onto itself into 3 sections, like a business letter. Using a rolling pin, flatten dough back into a ¼-inch thick rectangle. Dust with flour and from the bottom, fold into thirds again. Repeat process one more time, ending in a ½-inch thick rectangle. Place ¼ cup flour onto a small plate. Dip 2-inch cookie cutter in flour and then press into the dough without twisting. Pull out a biscuit and place on a buttered baking pan. Repeat dip-then-cut process until no more spots are available on the dough rectangle. Place cut biscuits on greased pan 2-inches apart. Collect scraps and roll into a ¾-inch thick rectangle. Fold into thirds and roll out to a ½-inch thick rectangle. Cut more biscuits and move to baking pans as well. Cook Biscuits - Quickly slip biscuits into oven, opening the oven door for only the brief moment it takes to slip in the pans. Bake untouched for seven minutes. Rotate and cook until they become a light golden brown, 7-9 minutes more. Remove and, if using, immediately brush with honey butter and sprinkle with sea salt.
Make Honey Butter (if using) - While biscuits are in the oven, cook honey in a small saucepan over medium-high heat until it bubbles and begins to caramelize at the edges. Quickly remove from heat before it burns and immediately whisk in 4 oz. butter. Set aside while biscuits finish baking.