r how to pay the two trillion dollars the transition
alone will cost.

The 2 trillion is not what they have to pay the retirees, it is the 2 trillion
the government won't have to spend on other programs.
If SS was not "on budget" that 2 trillion would be a lot smaller number,
perhaps even zero. There is still a very large surplus, that if it was
invested, would produce quite a nest egg by the time SS goes upside down. The
current "bonds" are just more debt we pay interest on with our taxes and have
no real investment componant.