Ukelele keyboard not found by System Preferences
In my opinion, you need a «your_language.bundle» in the /Library/Keyboard Layout/, which contains your "PhysicsType1 (MathPhysics)"

Then
Try pressing the "+" in the System Preferences> Keyboard> Input Sources, and then select the language in the list that appears, select your "PhysicsType1 (MathPhysics)"