One thing that's keeping my hand on the mouse and stopping me from going full keyboard, is the free scrolling mousewheel on logitech mice. I find it such an ergonomic and natural way to get to the right place in long documents (and code).
What I would really love is a keyboard with this sort of scroll wheel embedded just on the edge of the keys. All the keyboards I see with knobs / rotary encoders look cool but I can't see myself using a vertical knob for scrolling a document. Do any custom keyboard builds feature a mousewheel?
There are horizontal rotary encoders with click functionality (The component is called EVQWGD001). Unfortunately the pin layout differs from the vertical rotary encoders so you need a custom PCB or hack some custom wiring together. They're more common on split keyboards from what I've found.
You can buy a preassembled split keyboard with this from https://ergomech.store (I've been looking at purchasing one from them). There's also a seller on etsy who offers split keyboards with the horizontal encoder.
Around the turn of the millennium, I had a Logitech keyboard which featured a scroll wheel (and dedicated keys for media control, search and other stuff). I don't recall the model, but you might get lucky on eBay with a bit of searching.
[EDIT: After a bit of research, I found the model: Logitech Internet Navigator Keyboard]
What I would really love is a keyboard with this sort of scroll wheel embedded just on the edge of the keys. All the keyboards I see with knobs / rotary encoders look cool but I can't see myself using a vertical knob for scrolling a document. Do any custom keyboard builds feature a mousewheel?