“Whether or not it is demonstrable is not the point. It is whether you would accept it or not if it were demonstrated to you.”
As I said, I won’t say I won’t engage with you. Whether I accept anything or not will depend on if you can demonstrate it, don’t you think? Which is so unlikely that I think the act impossible. Don’t be concerned with whether or not I can accept something, be more concerned that what you want me to accept can even be logically defended.
Assume it can be. It’s a very simple thought experiment.
If it could be and was, would you accept it? Could you choose one way or the other?
Perhaps revising the question more in line with your preferences will make it easier.
If your having free will choice were logically defended, would you accept it?