Happen to have a few open at the moment, here's some images of the bits in that area that might help...
How the parts screw together...
Closeup of the indicator area...
The front lenses are very strong, they tend to take chunks out rather than crack if dropped on an edge for example and can take a lot of force when opening them. If you're thinking of cutting out the front amber section I guess it could be done with the right tools, but no idea what they are
As you can see it's not really sealed at all in that area, the bottom black trim on the fog light just screws into the clear trim and sits on top of the open indicator area. Would need to seal this whole area up yourself.
But you do basically have a 'clean' line at the bottom of the clear trim / top of the indicator area, under which you could do something creative without any obstructions.