I frequently find myself opening folders as vaults in Obsidian.
I was creating notes out of Chris-Bailey’s Hyperfocus and I realised that the graph view make more sense when it focused and localised.
To do that I found myself
Creating all the notes of that book in a separate folder
Opening the folder as a separate vault.
But when I do that the shortcuts and my customised theme is lost. Sure I can regain the theme by using my CSS file.
It’s not a perfect solution but you could copy the hotkey section out of .obsidian/config in the main vault folder. You may even be able to just copy the entire config over, I haven’t really tested that though.