We have two or three systems that already work more like this, for the elderly, the poor, and the military. To me it seems the easiest way would be to gradually improve and expand one or all three. This can be done with minimal fear from the general public because you aren't ending the previous system so much as building a better alternative. I don't follow any of this closely, but I know there is a bill to expand coverage for the poor and elderly to include vision and dental. As for price controls, the recent Inflation Reduction Act allows Medicare to negotiate drug prices like European systems.