No, Really, Try It!
I do not condone this for production. I would do this as a challenge for 2 to 5 minutes at a time, spread out. Which is how I did it.
I changed my settings in windows to be the numpad!
Now I can psuedomouse around. The Downclick and Upclick thing is going to take getting used to.
The click mechanism is just dragging functionality. Silly me! I have an article now: https://support.microsoft.com/en-us/windows/use-mouse-keys-to-move-the-mouse-pointer-9e0c72c8-b882-7918-8e7b-391fd62adf33
Go there, button maps work very well!