I'll bite....the 2A stands alone and does not require the 9A.
To your specific question....sounds good to me, we just gotta get the current SCOTUS to agree with you and their predecessors back in 1965 and apply it to CCW. remember, some states 'regulate-ish' CCW in their constitutions....well Missouri does anyway.
Justify is the key phrase that Missouri used to grant our CCW privilege. Works for me.Article I Section 23: Right to keep and bear arms--exception.
That the right of every citizen to keep and bear arms in defense of his home, person and property, or when lawfully summoned in aid of the civil power, shall not be questioned; but this shall not justify the wearing of concealed weapons.