Writings intended as wills.
Although a document or writing added upon a document was not executed in compliance with N.J.S.3B:3-2, the document or writing is treated as if it had been executed in compliance with N.J.S.3B:3-2 if the proponent of the document or writing establishes by clear and convincing evidence that the decedent intended the document or writing to constitute: (1) the decedent's will; (2) a partial or complete revocation of the will; (3) an addition to or an alteration of the will; or (4) a partial or complete revival of his formerly revoked will or of a formerly revoked portion of the will.