Thank you for responding, Chris.
That’s part of my problem: that effect does not create keyframes for me, and I had no need for them. I actually don’t know if you can add some sort of “general” keyframes, rather than the requirement of a keyframe to a specific property (like Position or Scale) that you want to change.
However, after posting my question, I realized that the effect does have an option for easily making it quicker, this effect just was not initially clear to me; the option is “Transition Completion” right under the “Fly to Inset” property in the Effect Controls tab. If I simply choose an earlier key frame, and choose 100% completion at that earlier frame, then the animation becomes faster.