I'm missing a Very High Contrast Mode for peripheral vision

[Bushmills]

preferably white roads on black background, no details (or, some non-distracting grey shade). Idea is to be able to glimpse only shortly at the map, or use peripheral vision, to get an impression of the road ahead while driving. Naturally attention ought to be directed at road, not at nav display - a very hard contrast display with just roads will make many bikers with phone or phablets attached to steering bar or tank happy (in conjunction with a properly functional "follow" mode, issue #6151)
GpxViewer Pro for Android offers something akin to this mode: "toner" mode, unluckily white background and black roads, which needs inverting screen colors. My currently employed Rube-Goldberg-style scheme does turn on inversion when that app is launched, but it'd be much nicer if such a mode is supported "natively" by the actual Nav app.

[sonora]

Closest thing we have may be Map style = Touring view, and set the Map mode to Night. I sometimes use this during daytime for peripheral orientation.