I think you’re not aware of this: Unreal Engine Branding-Richtlinien und Verwendung von Markenzeichen
You must receive actual approval from Epic before proceeding with alterations or custom treatments to the Unreal Engine logo.
And logo lockups are here: https://de45xmedrsdbp.cloudfront.net/BrandingMedia/Documents/UE4Styleguide-455099555.pdf
Hope you won’t get any legal issues because of that 