The purpose is fine. But as I mentioned above, the problem is if you want to use that 30 day extension you will need to inform your FSDO that you plan to use the AMOC, then make a signed entry in the logbook applying the 30 day extension to the AD. As to who can sign off the AMOC, I would ask the FSDO if a pilot can sign it off. If not, what the point of the AMOC? If you need a mechanic sign off for the AMOC, why not have him sign the AD off instead?one of the purposes of asking for the 30 day extension was to allow a meaningful opportunity for comments to be submitted and considered
Since the Feds accepted the reasoning of additional comments for the Global AMOC, the right thing to have done would have been to revise the original AD and everyone would have been off the hook until March.