You sir are almost certainly correct (Michigan law is not as clear on this subject as you are)!
However, ever heard of a LEO too be less than fully informed about the latest nuances of gun law and scholarly legal opinion?
What are the chances that a LEO would ever get this wrong and arrest me and confiscate my loaded and concealed pistol because he/she measures it with the FH and/or the Brace?
Hmmm...do I want--can I afford--to be the test case?