Unfortunately, some things cannot be adequately duplicated in some instances and the real pressure both from a psychological point of view and from a physical reality-coming from the attacker...well, you have to rely on muscle memory and other things to make up for that.
If someone has never been scared, how can you describe the concept and reality of "fear" to them? You never would be able to do that. Everyone knows a little bit of fear, at some time in their life, they have been fearful of something, I'm just using that as an example.
My Wife, for example...when we work together on various scenarios, etc., when I grab her, I mean it. If I choke her, I mean it. I don't choke her out, but she has reported seeing The Milky Way on occasion, and I won't release until I am satisfied that the pressure exerted by her, via a training knife, is such that I would be damaged enough to effect a physical release of her.
This is just one instance...there are others.
And no, there probably is not a whole lot better and there is a ton of things worse you could do.
So...in answer to your question, short of leaving a stack of bodies behind you, I don't think you are going to get the answer that you are seeking in this matter.
Another thing that one can do before practicing is running up and down some stairs, or some other physical exertion to get the hands a little bit shaky, makes all of the difference in the world when it comes to accessing, grasping, drawing and/or opening an edged weapon.
It works for the SEALs when they practice with firearms, it can work for everyone else too. The object being, if you cannot duplicate the actual adrenaline dump, you can try to duplicate the effects of it, shaky hands, etc.
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"You are no more armed because you are wearing a pistol than you are a musician because you own a guitar." ~Jeff Cooper
And the same goes for a knife...
And, I'm a Usual Suspect.