I found acrylic fresnel lenses which means I can laser cut them!  Typical floppy magnifying sheets are pvc thus toxic to laser cut.    However the acrylic lenses are a bit thick (1/16″) and the ridges are bigger- they work best with larger shapes, detail gets lost easily with the ridges.

We used transfer tape to minimize stray reflections.

Also, polarizers make the world a better place.