On the one hand: cool, if you're an avid emacsen or a vimmer, yeah, ok. OTOH, gosh that is such a cluttered and cumbersome setup. Just bring in vim/emacs bindings to your jupyter: https://github.com/lambdalisue/jupyter-vim-binding. There's a handful of plugins, choose one.

Whatever the final solution everyone decides should be, I just hope it doesn't involve having two redundant windows open side-by-side like that. Ideally, it should probably be instantiating an emacs client within Jupyter as that seems the most logical.