i don't feel like reading all of that, but basically it's not the fact that you have non dot approved things on your vehicle that is illegal, it has to do with the fact that you are removing a safety feature (rims) that ARE DOT approved
short lesson: DOT is Department Of Transportation, a government group that regulates automotive products, certain things must be approved by them to be used on the street, these include illumination lighting, safety lighting (tail lights) windows, windshields, rims, tires, ect... take a look on your rims they will have "DOT approved" stamped on them, same with tires, windows, headlights, any modification to any of these products renders the product no longer approved as it is modified... this is why nightshade is illegal...
in canada, there is Transportation Canada, which is much the same, the regulations between the countries are much the same, with a few differences like daytime running lights in canada...
when you modify rims they aren't the same rim that the DOT approved, when you bought them... this is also why techincally painting your headlights (like i have done) is illegal, because you are modifying the headlights...
beadlocks in themselves are NOT illegal, it's people who are unlicensed to modify rims, modifying rims and putting them on vehicles to be driven on the street that is the issue... that's why you can buy DOT approved beadlocks