Grace, there's a reason (actually more than one) for why the effective vaccines against SARS-CoV2 are focused on the spike protein, and not on trying to give the immune system a wide range of different protein targets to sample. It is also partly why the monoclonal antibody treatments for mild-moderate covid are directed only against the spike protein.
Maybe a soccer analogy would help? Let's see, your team has to defend against a PK, and in this game, the rules are such that you can add 10 additional players to try to defend against the PK. I'm going to guess that you would want to add 10 goalkeepers in goal, rather than place 10 other players all over the field. Maybe someone else has a better soccer analogy.....