Depending on your family history, some countries grant you rights to citizenship and a passport based on whether you have a family ancestry connection with them, e.g. you are a citizen of country A, but you have a parent or grandparent born in country B.
Not that it helps you, but the UK had this (and still do?), and other countries like Cyprus, Poland, etc had/have them too.
Worth looking into as an option in addition to other CBI programs.