I’d really love access to Niagara and 4.26’s warp/deformer tools…but alas I’m stuck on 4.22 because removal of Gaussian DOF has completely ruined the look of my stylized side-scroller where the setup is “Keep Camera Far Away” and 25 FOV - with Gaussian DOF to blur the Background 
Been stuck with these old tools for 2 years now. When I upgraded a copy of the project to 4.26 it just completely ruins the effect with the removal of Gaussian DOF…
Is there a way to just copy over the old camera source code? or create a custom camera type?