Interesting. How would you target proteins with a conventional vaccine? Or when you say conventionally effective vaccine, do you only mean in that it stops transmission and infection?
Also, if the creation of a vaccine targeting 6-8 proteins is 6-8 times harder, than by definition the solution is not easy.
If you are suggesting that an alternative, more broad acting, yet still mrna based intervention would be able to eliminate covid; then even if that is possible, it would fail miserably on a cost/benefit calculation.