As I got tired to way any movement in this direction I had created Tampermonkey script that add some shortcuts and UI tweaks to Evernote.
It has own story and evolution (some day it has some code to remove ads from UI, etc.). At the moment it add two the most useful shortcuts:
Ctrl+Shift+Slash - turn on/off Evernote search (if available on the screen).
Ctrl+Shift+Backslash - tunr on/off full screen mode.
If you have already installed Tampermonkey (this add-on/plugin available for Firfox, Chrome, Edge) then you could install script by direct link: https://bitbucket.org/achernyakevich/tmsp-evernotehelper/raw/master/EvernoteHelper.user.js
You feedback and features request could be left in the project: https://bitbucket.org/achernyakevich/tmsp-evernotehelper/