May I derive from your words that SPC's dixie circulation is fine as long as the SE government does not receive or spend them?
SPC's dixie circulation only matters insofar as private enterprise is willing to accept it, as I see things. What exactly is private enterprise and what exactly forms the Region and its "tentacles" has not been addressed.
The Regional government can only accept and spend Atlasian currency as a legal tender (for example, the Region could not accept bananas as payment and spend bananas in funding its obligations). Obviously, this Court cannot tell a Region when to actually spend Atlasian currency and the dictates of the FOCA are so vague that we, nor the SE government, probably have any clue as to exactly how any "removal" would be done or how this would result in an informal currency due to such removal, but I am sure the active imagination of Respondent, coupled with his lack of formal education, can make up a scenario in his mind where this occurs.
Simply put, this Court, in my view, is not going to tell the Regions how to run themselves. If you want to change what the Southeast has done, there is ample support for at least two bodies having certain powers to do so.