Yes yes I'm sure smarter people than me have done lots of interesting logical things to philosophy over the last thousand years.

And I maintain my simple point: if your ethical system doesn't allow the flexibility to not give up Anne Frank, it's a bad ethical system. Unless you believe giving up Anne Frank isn't wrong? Then you're a bad person and shouldn't be considered in conversations about ethics!

Design it in a way to have good outcomes if you're worried about repugnant conclusions. Personally I believe putting it on paper is a fool's errand - vibes based ethics seems to work as good as one can get from an ethical system.