One interesting way to do this would be to upload your public key inside an image, using steganography. (a new sort of profile pic!)

there seems to be plenty of steganography implemented in js

A quick google revealed these:

http://oakes.github.io/PixelJihad/about.html

http://www.peter-eigenschink.at/projects/hideme/demo/

But they'll have to be converted to npm/browserify

oh, on that note - I have had some luck making pull requests to get people to use browserify! way better to get the maintainer to put something onto npm them selves.
At least, post an issue telling them that you have published their thing,
so that they can take it over when they are ready.