Set default editor values for public variables in derived classes

Say I have these 2 classes:

 public class Foo : MonoBehaviour
 {
     public bool Awesome = false;
 }
 
 public class Bar : Foo
 {
     public bool Awesome = true; // Wrong!
 }

When I add Bar to a GameObject I want the default value for Awesome to be checked/true in the editor. When I add Foo, I want it to be unchecked. I want it to be the same variable though (base class and derived share same instance), so I know redeclaring it in Bar is not correct.

Normally, in a non-Unity project, I would set the value in the constructor, but I understand it isn't safe to use constructors for MonoBehaviour derived classes.

I don't want to use Start or Awake, because I don't want to set values when my game starts or scene loads, I just want to control the default values in the editor (design time, not run time).