Your unstated assumption is that dealing with climate change is a cost, not a benefit. So, you'd expect these selfish countries to adopt the bits of the progra

Your unstated assumption is that dealing with climate change is a cost, not a benefit. So, you'd expect these selfish countries to adopt the bits of the program, that benefit them, and stall on the ones that cost them. So e.g. if you import fossil fuels, you'd adopt renewables faster as they are cheaper, more predictable, more reliable etc. If you import oil you'd move to EVs, if you import gas you'd move to heat pumps and so on. Efficiency would be prioritised, as would things that clean up local air pollution.