I had to look up Eevee. In case anyone else does too: https://docs.blender.org/manual/en/latest/render/eevee/introduction.html

I'm not sure how Eevee would be any better for cartoon rendering than Superfly is (aside from being faster of course). If it's possible to do in Eevee using Cycles type nodes, then in principle it should be possible to do the same in Superfly with the same Cycles nodes. Maybe it is?

That said, personally I use Superfly and better Cycles previews would be a huge upgrade.