I've been doing this (with a different util) as my primary way of navigating for 20 years. It makes screen clutter irrelevant. Without physical function keys, I

I've been doing this (with a different util) as my primary way of navigating for 20 years. It makes screen clutter irrelevant. Without physical function keys, I can't think of a way to maintain this with the same convenience, being able to do it one-handed with either hand, avoid conflicting with stock shortcuts, and not sprain my hand. Fortunately, I use an external keyboard much of the time, which I selected almost wholly for its proper 4-groupings of function keys, letting me touch-type them.