… So it looks like it’s not possible to achieve stylized effects like these with the new tonemapper. Which is sad, because a lot of stylized work is being done with UE, and completely cutting it off after 4.15 is somewhat a harmful move 
We could really use some kind of tonemapper switch or a separate glow-amount input (not driven by emissive) in materials, something that @Luos has suggested.
Here is how it looks from my perspective: I just can’t make my effects the same as before, to make them work properly with my stylized art style. Knowing that the old tonemapper will be removed in future versions… It puts me in a dead end. And I know that I’m not alone with that situation.