In addition to the difficulty in finding volunteers to carry the football, that approach would also fail to address the authorization / orders to release tactic

In addition to the difficulty in finding volunteers to carry the football, that approach would also fail to address the authorization / orders to release tactical nuclear weapons such as those carried onboard ships. Or alternatively a request for release from a NATO member, which only needs to be 'approved' by the POTUS and his designated second-man ( SecDef or theatre commander ).