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If you leave WF context as a plain-old context as I suggested you'll get exactly what you are asking for, except that the actions will not be grey. (To see just the "active" WF actions, just select the WF context in the sidebar.)

As you've described it you want WF actions treated as regular actions in all respects but formatting. You could manually format individual WF actions to be grey, but there's no way to have a context behave like a regular one but format its items differently.