Just because something can be done isn’t necessarily a reason to do it.
Version Tracker lists programmes, daily, that are available on Mac computers.
This one turned up today:
Keymileage - 0.5.2
measures how much your fingers move to type
Keymileage figures out how many miles your fingers travel when typing. You can even measure really long files.
Keymileage tabulates in both the simplified Dvorak layout and the QWERTY layout.
If you can think of a reason for having this, then you can at this site ~ and free too!