Yes, of course, I was definitely imagining you were struggling to get simpler scenes to work. But also, proportionally few of your triangles in any given scene should be near-plane clipped. It's OK to have a slow path for it, and then speed it up later. I've never felt the math for the adjusted barycentrics is too hard, but it can take a bit to wrap your head around. Good luck :)
You and the GP have different rasterization algorithms in mind I think. The GP, I presume, is talking about a classic scanline-based rasterizer rather than an edge function "am I inside or not" type rasterizer that GPUs use.
