Quickly switch between toolbars

Use autosensing with hotkey only for as many workspaces (i.e. toolbars) you need. Write a very simple script to send the hotkey and create a toolbar button to run it (in your case you can create completely transparent button image for it). I've used this method quite a bit and it works well.

You don't need to set up autosensing applications. Set the timeout to 0 if you don't want the toolbar to switch back automatically.

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Is this what you want?

https://www.youtube.com/watch?v=VK2gCyADQjk

You can also run shortcuts on mouse hover.