Good question.
1: Make a custom shrouds, lenses, and housing for the turn signal so that it'd fit into the two top holes, use the same socket as your stock one (the bumper one). You can put together by JB welded it. What you can do is make clear lenses, and epoxied to those two holes (top ones) and make it as if one piece. Then fill the insider of that hole with high temp paint or high temperature resistance films. Then cut off the reflector from the stock bumper so that it'd fit right onto the holes from the back of the bumper. Then epoxy it in. So you'll end up with a dead mounted-in bumper lamp. Then just plug the bulbs into the sockets on the back of those holes.
2: Do a relay on your Parking light, since it's a single filament, it'd work. Make sure you use a good ambered colored bulb or amber corner and the bulb have a Very bright output so that the Headlamp lighw won't overwhelm the signal's.