Howdy Mentlegen! If you used EZNIF Converter, that should have converted the keys too. Did you select the keys when you selected the mesh?

But either way, Minuteman is a vanilla character, meaning his mesh is in both games. You can just pluck him out of FF2 to use as you like.

If you want more help and a TON of resources, including more meshes, skins, skopes, and maps than you can imagine, you should join the FF community at: http://freedomreborn.net/forums/index.php

You'll get a much better response there than here.