Rendering lens distortion using post process material in virtual reality ?

I’m currently trying to render lens distortion effect using a post process material. I found that blueprint wich work very well:

But when I’m playing it in VR, the post process is rendered twice, in the center of each eye, instead of one global effect in the center on my vision.
I’ve found that blueprint which show me how to create a post process material which render for both my eye at the same time in the center of my vision :

But I didn’t manage to apply it to my lens distortion blueprint.

How could I render my lens distorsion post process material correctly in VR ?

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