How you control costs in government healthcare is easy.
The government decides how much to put in healthcare, and that’s all that’s available.
The fact that people will die on waiting lists is secondary.
One of the ways of lying about this issue is the change of language. Single payer is monopoly. Economists have studied monopolies and they are NEVER mysterious. You pay more and get less. And they are enforced by Government.
Anyone who believes a monopoly will result in savings, has to be an insider to the monopoly...they are the only ones who save.