My solution: on all of the keyboards I've programmed (which are all ortholinear or vertical staggered ortholinear), I have a numpad layer. When I hold down F my right hand home row is vim style arrows. D and it's a number pad. S and it's a symbol pad. Common programming delimiters like <>{}() are not on a layer, instead they're hold/tap with my modifier keys on my base layer (Inspired by the space cadet keyboard).