The EU has leverage? It's taken over 20 years of this non leverage to fail to achieve a trade deal with the Mercosur block. The idea that the EU has any comprehension of how to do an international trade deal is nonsensical.
The EU is just so hopeless at anything you couldn't make it up. The only kind of leverage they have is placing a ball and chain around any business inside the EU with the nous to attempt to trade globally.
The UK will be set free soon from these shackles, like it or lump it eurochums, I understand how you might fear the new kid on the block. But you haven't got the choice to stop it anymore. Try not to be so obviously envious... Tick tock.