I came across this shortcut mapper for Lightroom and Photoshop while catching up on my reading a few weeks back and have found it rather handy. Unfortunately, I can't recall where I read about it and can't give them credit for publicizing this great utility. It may have been a PetaPixel article. What I can tell you is that this is a GitHub project and more information about the app and creator can be found there (link at the bottom of the post).
You can select the app as well as the module in the case of Lightroom. If you hold down the Control, Alt, Shift (Windows) or Control, Option, Shift (Mac) keys the keyboard will change to reflect the new shortcut keys.
If found it rather handy and my mental shortcut list has grown quite a bit since using it. I hope you find it helpful.
To use the the web app, click here.
To go to the GitHub site for more details on the app and creator, click here.