Earlier quoted context omitted.
Here's a good starting point: https://deskthority.net/wiki/Alternative_keyboard_layouts Also: http://xahlee.info/kbd/most_efficient_keyboard_layout.html
i spent several minutes on both of these sites. they are interesting extensions into the topic of keyboard layouts, but there was almost no research or data on them, other than simple mechanical metrics.
* https://www.maltron.com/lillian-malt-papers.html
* https://www.maltron.com/a-keyboard-to-increase-productivity-...