This thread sparked a question in my head. Imagine that you are in a situation where you need to dispose of you wallet seed backup, but it is etched on a steel plate - how would you do it? The easiest answer is likely acid, but not everyone has access to it, and depending on the steel plate, it might be even highly resistant to corrosion. Another option is to damage it mechanically - in many of these steel plate products you are supposed to etch the words, so it should be possible to erase them or render unrecognizable. But it's likely hard to do thoroughly and traces of the words could remain.
Any more ideas?
I read a similar topic here, although it was talking about same steel plates and how it could be navigated through airport security checkpoint scanners and not be discovered. Reasons being it could be captured by someone who knows what it means and thus could be a lead to a hack.
Although, I doubt it would lead to more extreme thoughts, to dispose a seed plate backup shouldn't be much work if you were the one who did the etching in the first place.
The tools you used are already present and am sure by altering the letters of the alphabet, or by adding just a few etched alphabets to the ones already on there would alter the real pronunciation or spellings of the seed phrases, rendering it meaningless to someone who sees it as a special and customized designer product. Adding crossed lines to the etched words could also alter it making it meaningless too.