I'd send hundreds of them, every one full of old socks or something. Make it very expensive/annoying for them.

There is nothing to gain for Ecuador by escalating the situation. Already they spent a lot of political capital and goodwill vs US/UK by hosting Assange in the face of overwhelming hostility, cracking practical jokes at the MET would only make things worse.

There's got to be Assange lookalikes that can muck with their surveillance.

There is a lot of pen-testing fun to be had here. At the least you'll annoy them and amuse you, and at the best you cause them to expose the holes in their security capabilities.

It's like fuzzing, but with clones!