Has there been any research on one-handed Dvorak layout and smartphone (swipe) keyboard travel distance?

The Dvorak simplified keyboard is optimised for low finger travel distance, leading to faster typing and less wrist pain compared to the Qwerty layout. On a smartphone, most people effectively only type with one finger, either by touching the letters or by swipe typing. Dvorak may therefore not be optimal for smartphone keyboards; see also this question on a swipe specific keyboard.

However, Dvorak also designed right-handed or left-handed single-hand keyboard layouts, such as this right-handed layout:

I would suspect that a single-handed keyboard layout is a better approximation of smartphone typing than a dual-handed keyboard layout. Has there been any research comparing the hand travel distance when "typing" (either by touching keys or by swiping) on a small touchscreen (such as a smartphone) using either Qwerty, normal Dvorak, single-handed Dvorak, or even a totally new layout optimised for smartphone usage?

Closely related: How to improve the smartphone keyboard layout?