I agree that a totally accurate simulation of a philosopher ought to arrive at the same conclusions as the original. But a totally accurate simulation of a human being is incredibly hard to obtain.

I've mentioned that I have a problem with outsourcing FAI design to sim-humans, and that I have a problem with the assumption of "state-machine materialism". These are mostly different concerns. Outsourcing to sim-humans is just wildly impractical, and it distracts real humans from gearing up to tackle the problems of FAI design directly. Adopting state-machine materialism is something you can do, right now, and it will shape your methods and your goals.

The proverbial 500-subjective-year congress of sim-philosophers might be able to resolve the problem of state-machine materialism for you, but then so would the discovery of communications from an alien civilization which had solved the problem. I just don't think you can rely on either method, and I also think real humans do have a chance of solving the ontological problem by working on it directly.