Feel free to use it as a common thread for all things footnote-related.
For me, cmd+shift+E is occupied. Would you consider enabling customized keyboard shortcuts? Perhaps not only for footnote, but for all. Dunno how much coding would that involve, but would help integrate Bear seamlessly into workflows.
Do you know that macOS already allows you to customize the shortcuts of every application? 
If you find a conflicting hotkey (or something you don’t like) you can easily change that, there is a tutorial here that will help you -> https://osxdaily.com/2017/08/08/create-custom-keyboard-shortcut-mac/
Hope this helps!
That’s dope, I had no idea!