Could work, but needs some fleshing out. The height of the screen may not work well as a wood stove (too tall). Maybe tent stakes can be used to provide adjustment. Wood stoves require huge mouths to feed them, which may not work well when used as a screen.
Titanium would be the material of choice, but for experimenting, nothing beats shim steel, about $15 for 6" x 120". .0025" or even .003" would be my choice, depending on your pot size.