Seems a bit of overkill to me. Tumbling before depriming keeps you from scratching up your sizing die with dirty brass. Since you plan on using a universal decap die, that isn't an issue. Tumbling after depriming ensures that you get the primer pocket clean, though how much of an issue this is is a point of debate. It certainly doesn't hurt and a clean primer pocket helps assure consistent primer seating.
I tumble once then load using a decap/sizing die. Still a little crud in the primer pockets but I haven't found it to be a problem.
If you want the spotless primer pockets, decap then tumble. If that doesn't bother you, tumble then load, skipping the universal decapper.
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