Question making 2+ lamps cast in same shadow layer?

So, i was making one of my first projects in unity when i was playing around with the next setup;

I had this lighting setup where multiple lights cast shadows on different layers to achieve different results for the player shadows compared to environment shadows;

The issue with this hacky method is obviously the fact that the different shadows are being cast on top of each other. Is there a way in unity to make multiple light sources cast their shadow into the same "Shadow Layer", assuming unity has one (accessible?)?