Wow! I am new to Unreal, and I didn’t expect to find a pixelazer without pixel creep. And I’ve looked. 
Unity has two really good assets, ProPixelazer and UPixelator
with this techniques and a lot of other nice and important things: Per-Object Pixelisation, Per-Object Outlines, Edge Hightlighting, Dither and so on (ProPixelizer website with screenshots).
I even wrote to one of the authors, and received this answer:
I actually came from unreal first and moved to unity after. At least when I was still using unreal, the rendering pipeline is much less flexible (but this also allows them to optimise it more for their style/use case, so both platforms have their strengths). This was around 2019 or so, things might have changed since then! I think if I were to move to a new engine, it would more likely be bevy (preferred, pending editor) or godot…
At that point I thought I wouldn’t find this kinda thing for Unreal, which is very sad. Do you have any plans to continue developing you asset? I think you have a basics right, just need to add some features, like 1px outlines and so on.