While not as tight to the blade as a riving knife, I've found these splitters[1] paired with a zero-clearance insert are an excellent alternative, and can be custom-fitted to almost any saw with nothing but a hand drill and the saw itself.

[1] https://www.microjig.com/collections/mj-splitter

Thanks. I only started using table saws a few years ago, so I watched a lot of youtube videos on safe operation.

It seems clear that using (riving knife) + (blade guard) + (push sticks or similar) + (feather board) + (careful adherence to safe operation) eliminates most of the risk.

I'm still unclear how much risk remains when following those rules. Maybe because most injuries I hear about involve people skipping at least one of those five elements.