Im making a 3d print object for the dishonored mask. A big part of the face of the mask is made look like the metal casting for the mask failed, and a plate was hammered into the face. I have sculpted the face WHOLE but I need a way to get that bit out of the model. I tried using boolean but the topology went horrible, and I was not able to sculpt the model around the cut edges.
Is there a more effective way to do this?
Plate is hammered into the right face (left face from the wearers view)

This is how I originally intended on doing this, copied the plate (I have already made the model) and made it thicker, and applied boolean modifier.

This is the wound i got from apllying the boolean modifier. (after inflating, it was flat right after booling, but this shows how bad the topology got.)

Here is the face
And the plate
Also this is the first time I model, so please don't give super complicated answers, and if they are, please explain well.
Thanks in advance for your help