Depends on the tolerance of what you're trying to hide. If the goal is just to obliterate the way something was previously anti-aliased, or make it trigger tons of false-positives, then a small blur and not relying on the inbuilt rasterization would probably do the trick.

Prior to this it had never occurred to me. But yeah, more randomness. Noise filter and blur, then a bit more noise, then photograph it, print the photo, scan it on another device, put it in the washing machine, leave it on the porch for a week and repeat.