chupoclops or phase mantle?
They are supernatural so they do not work in an AMF.
Layers is something I'm going to ignore, you don't shave off the metal strips in an enforced stone wall, you don't attack each brick, you don't attack the window pane or shutters or door frame. Total thickness is enough.
and an unmentioned part that an activated antimagic torc glued to an arrow clears the 10ft faster than gravity can pull the wall down so theres still a bit to go.
You misunderstood the part about layers. The wizard would be wearing multiple shrunken items to block AMFs, so even if you managed to pry one off him of smash it an new one would just pop up and cover the wizard again. Given that a fighter type has extremely limited actions per round in an antimagic field that would render most tactics to getting rid of the hat null and void. But things like the shrunken clogs would work still. Although it would make it very hard to get at the wizard even him being in an AMF.
About the arrow bit, would that not be subject to the 50% chance of arrow breakage, if so you would need multiple ones, which might be a good idea anyway? And even if it was wouldn't it just activate the hats so the wizard is protected and he can take a bit of time just turning the torc off.
A good idea to give the fighter type a slight advantage would be the boots of temporal acceleration, which would give him two rounds of time stop. He could then get right next to the wizard and activate the AMF so he would be inside the cone with the wizard.
