When I’m arguing with a pro-abort, I choose the opposite tactic -
for every fringe case they bring up, I’ll rhetorically “allow” that exception,
leaving my “opponent” arguing for abortion on demand for convenience, and then I’ll make them defend that position.
If they’re the typical sheeperal who wants to think of themselves as a good person, instead of a radical feminist with a seared conscience, they are ashamed (but don’t change their mind - I’m just planting seeds).
Good strategy.
You just never know what fruit that might bear as they think about it.