I think that would be damn near impossible. The fog light, fog light trim and some other plastic bits all kind of mount in the same places, almost to each other in some cases, and there are bumper supports and the fog lights that are held on with screws that you'd only be able to access from the back. I removed all of the plastic trim off my old bumper when I had a new one painted. Since I was putting the plastic trim from the old bumper onto a new bumper I cut most of the bumper tabs on the old bumper with a dremel to get the trim pieces off. I can't imagine getting them free while trying to preserve the bumper tabs.
I think you're best bet is to remove the bumper and work from the back side. You'll need a lot of trim tools or a lot of hard plastic pieces to hold each bumper tab out while you work across until you get get sections free, if that makes sense. It's not the most fun you'll have working on a car.
Edit: Here's a shot of the back. The trim piece you're referencing is gone but you can see all the tabs it locks into.
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