I firmly believe that for any meaningful change in tax exceptions for multinationals one needs to bring it to the masses, like you say.

For example by creating a multinational entity that swallows you all the small shops, while letting them be the owner as they were before. But they now use a service that consistently costs so much that it's not returning a profit. While they also start a new business through a foreign Enterprise that is stationed in any tax Haven you have your eyes set on. When on scale this will drain the tax income of most small shops and must force the government to shut down these constructs. Challenge being that in doing so the precedent crested will also force the multinationals, like Shell, Unilever, etc. To shut down their unfair tax advantages.

I don't think the idea is novel, and I think it's extremely risky, but something worth chasing I believe.