I am currently relearning my muscle memory typing. I was previously using my right ring finger for the P key and now I am using my right pinky finger. Relearning muscle memory that has been reinforced is difficult. How things are learn originally factors into many repetitions. The term neuroplasticity comes to mind.
I am trying to document the process as the process is valuable. My typing speed is currently greatly reduced trying to rework and hit all the keys with the correct fingers. I might not have reworked all the key presses to conform to best practices. I am attempting with a smaller set of changes (including middle finger for the i key, and right ring finger for l key) and seeing how they will effect my typing speed after I relearn them. Hopefully including my pinky will give me faster throughput, documenting my progress will likely be useful, possibly for others that might want to relearn their typing skills to conform better to best practices as well.
Sharing information about process and speed of ability to change learned muscle memory habits has the potential for useful.