I am interested in how frequent travelers manage these security measures (especially abroad). For SMS: quickly obtain a burner phone, log in to Chrome, something something SMS or Authenticator? For Authenticator: log in to Chrome on any machine you can locate that you can trust? For the printed backup codes, you carry them with you as you travel, and through security?

I am trying to develop a security process that I can rely on. It only has to be better than what I have now, it doesn't have to be bulletproof.