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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look at the hillside keyboards and how they have the extra keys. you could use the same idea for your arrow keys.
That was actually very similar to my first prototype but I went another direction.