Could be a slider with the same radio circles denoting the stopping position, could be those circle volume buttons with labeled marks, could be non-circle switc

Could be a slider with the same radio circles denoting the stopping position, could be those circle volume buttons with labeled marks, could be non-circle switches like these (other/position/steer on the right) https://img1.wsimg.com/isteam/ip/b81ca6f4-730a-4561-852c-0967c494c50f/20210408_165433.jpg https://img1.wsimg.com/isteam/ip/b81ca6f4-730a-4561-852c-096..., etc Re. the missing default - you can have an explicit element "none selected" with the slider positioned there Plenty of options to make UI more intuitive