Read the verbage in 12USC411. A claim whereupon relief may be granted - "They shall be redeemed on demand....."
Therefore in my simplistic mind - "Demand is made [present tense] for Lawful Money per 12USC411" contemplates a claim upon which relief may be granted to make a use of PUBLIC MONEY subject to the terms of use established in Statute. Therefore, in my opinion, there remains a trustee to stand surety for the existing notes and there is no need for me to stand as accommodation party for new "book entries".
I suppose the word "per" could be changed to "in accord with"....my intent is my own.