Welcome to the blueutil wiki!

Install blueutil Start Automator, and create a new Quick Action (Service). Set "Service receives selected: to "no input" in "any application". Add an action named "Run Shell Script". It's in the Utilities section of the Actions Library. Insert this bash command into the text box:

/usr/local/bin/blueutil -p toggle

Test run it using the Run button (top right). Save it, giving it a service name you can remember. Go to System Preferences -> Keyboard, and go to the Shortcuts tab Go to the Services section, and scroll down to General - you should find your service there. If you select the line, you can click "add shortcut" and give it a keyboard shortcut.