The only thing you'd achieve doing that is to change the "main function" of a device to somethings silly, like a thermostat being sold as an art decor with the optional additional of functioning as a thermostat too.

> change the "main function" of a device to somethings silly, like a thermostat being sold as an art decor

that seems like it can be addressed by making sure that the regulators who enforce these laws have more object permanence than a 6 month old baby.

like, if I try to sell a "metal sculpture" that by sheer coincidence is capable of firing 9mm ammunition, I'm going to have the ATF knocking on my door real quick, and they're not going to be fooled by me claiming "no that's art"

This is why the legal system is run by people with brains and reasoning and not python scripts. A real person will see that a thermostat is actually a thermostat.