You can use Set Global Pitch Modulation to set the global pitch. It seems like it’s some sort of mixture of Pitch modulation over Time?
And you can use Set Global Time Dilation to slow down all physics. But since the Doppler effect is also physics based, it will probably get confused.
So you might have to apply the Doppler effect to a sound wave before you import it into your project. For something like bullets you could set a hitbox around your character that activates the sound-cues so you’ll always get that pitch perfect Doppler effect.