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.
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"
Why would the ATF go after them instead of YOU?
But then again, one problem is that Big Tech has enough money and power to completely overwhelm the regulators...