I am posting this in case it would be helpful to someone. I have remapped my keyboard in the following way to allow the left hand to remain over a single position on the keyboard to input all fingering commands required in most piano fingering.
Using Keyboard Maestro I remapped the Function Key 6 to type the number 5, F7 to type 4, F8 to type 3 and F9 to type 2 and the colon-semicolon key to type 1. (The colon-semicolon is reassigned to F12.)
In this way the fingers of the left hand can fall naturally on F6-9 and the thumb on the colon key to be able to input 5 with the fifth finger, 4 with the fourth finger, 3 with the third finger, 2 with the second finger and 1 with the thumb. This allows immediate instinctive input for a keyboard player who has years of tactile and visual association of those finger numbers with those fingers.
It also allows the thumb slide easily to the comma key to input chordal fingering, and the second finger to the hyphen to input finger interchanges.
The heel of the hand is positioned over the space bar to easily press down with the hand to advance the fingering popover from note to note.
The L key is assigned as a Dorico Key Command to bring up to the fingering popover which allows the thumb to activate it instantly.
This system has sped up my input enormously.