There is already a fairly robust system for categorizing your hotbars, but it requires some setup that's not visible in the default UI. The basic idea is that you set up your hotkeys for certain purposes -- adventuring, tradeskills, Ascension classes, AA builds -- and take a "snapshot" of the hotbars in the various layouts. Later, you can call up any of the snapshots using a button or a macro. In your case, you could add or remove the hotkeys that you want to see in each of your categories, then save and load them as needed.
To try this out, go to the Hotbars page of the window manager and click Save Hotkeys
. In the window you can choose a category ("purpose") for the layout from various presets (Ascension classes, soloing, tradeskilling, etc.) or create your own purpose. Set up your hotkeys in this way for as many different layouts as you like. Then you can call up a saved layout any time by clicking Load Hotkeys
(or with a macro button).
If you want to set up hotkey sets manually without using DarqUI, I can also show you how to do that.