If a SPC can operate in the “U.S. Corp” world and private world how does that work? especially since we are claiming we are not to be U.S. Citizens

The whole point of distinguishing the separation between the debtor and the secured party is to be able to act on both sides clearly. If you are entering the public it should be done or transmitted through the trust structure that you gain control over through the process. Think of that structure as your shield. You are able to use it without giving any personal liability while contracting on the public side, leaving the private man private. This trust will mimic the birth certificate name such as COULD BE ANYONE TRUST