The glass etchant is probably not going to work. It’s polycarbonate, not silica glass. Sand is interesting but maybe too coarse. Stuff like 1-10 micron industrial diamond power, silicon carbide/aluminium oxide blasting media is the bane of my existence when trying to clean shiny things :(
There’s already a startup trying to get the FCC to give them half of the 915mhz band (meshtastic, smart home stuff, ELRS, ham radio) for a pay to win GPS alternative.
https://www.youtube.com/watch?v=R_0GzK2oAVM
Tldw: last week Dev postulated this would be the first attempt to probe the courts because trans inmates are probably the least publicly visible group available for such an attack.