We prove that the key map on crystals of any classical type can be reduced to a key map on simply-laced types by using virtualization of crystals. As a direct application, we obtain new algorithms to compute evacuation, keys, and Demazure atoms in type \( B_n \) in terms of Kashiwara-Nakashima tableaux. In particular, we are able to use type \( A_n \) and \( C_n \) methods. For type \( C_n \), we apply the results obtained by Azenhas-Tarighat Feller-Torres, Azenhas-Santos and Santos.