Your method to deprime is about the only way I know of to
remove the primer with out breaking the center post between the
two flash holes. However, these primers are larger in size so primer
arm punch for seating the new primer is undersized. Did some of
these many years ago using the old Lymon 310 nutcracker type
loader for the Brittish 303. To me, very time consuming and other
than if there were no other way, it wasn't worth just using once fired
or new USA brass.