Thanks to everyone here for the suggestions. Key pitch is now 19mm, I've removed the top row and added a second index column.
I'm not really pleased with the arrow pad placement, but I haven't found any better place yet.
I'm still working on the layout...
Ergonomic, split and other weird keyboards
Posts must be of/about keyboards that have a clear delineation between the left and right halves of the keyboard, column stagger, or both. This includes one-handed (one half doesn't exist, what clearer delineation is that!?)
i.e. no regular non-split¹ row-stagger and no non-split¹ ortholinear²
¹ split meaning a separation of the halves, whether fixed in place or entirely separate, both are fine.
² ortholinear meaning keys layed out in a grid
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I'm in camp "arrows on hjkl on a layer, home/pgdn/pgup/end right below that", but if you really want them as physical keys, I'd probably stuff them below the pinky cluster, right next to the outer thumb.
That, or maybe something dpad-like on the left edge, close to the H.
Edit: Oh, for clarification: I'm a programmer, as well. I make plenty of use of the arrow keys, so it's not like "eh, let's stuff those on a layer, I never use 'em anyway" or something.
Yea I absolutely cannot imagine having to move my entire hand to a arrow cluster.
Right Thumb mod + hjkl gang