I am a retired SFC. I was awarded the honor of Honorary CSM and it was approved by a MG. My question is this, can I wear the rank?

AR 670-1, Section 21-3 pretty much says no. Particularly subsection C

"Retired personnel not on active duty may wear either the uniform reflecting their grade and branch on the date of their retirement, or the uniform prescribed for personnel in the AA of corresponding grade and branch, when appropriate, but may not mix the two uniforms. Personnel will wear the grade as shown on the retired grade of rank line on their retirement order."

Wear whatever rank you DD214 says you retired at.

Do you have official orders from DOA? If not no.