alt Hacker NewsAnother thing you can do is to install a font with jumbled characters: "a" looks like "x", "b" looks like "n", and so on. Then instead of writing "abc" you write "jmw" and it looks like "abc" on the screen. This has been used as a form of DRM for eBooks.
It breaks copy/paste and screen readers, but so does your idea.
Font remapping is actually on the v2 roadmap. The reason v1 uses CSS ordering instead is it preserves screen reader access. Tradeoff is it's reversible (as another commenter just showed). Font remapping is stronger but breaks assistive tech. Solving both is the hard problem.