Maybe adding a fat tax (say, 50% sales tax of endpoint product sale price) on fundamentally unrepairable products. This is a spectrum: if a company could glue a phone and get a thin sleek sexy glass brick OR it could use some small screws and it won't be quite as slender/sexy... Going with the former on average with every a/b choice in design should trigger the tax and effectively kill your product vs more compliant competitors.

I've been wanting to see this applied to anything with a universal machine, where it was made to prevent the owner from modifying software/firmware/microcode. As a customer, I want Stallmanism enshrined in law dealing with both computing and product design.