Looking forward to this!
If there was an option for additional colours as stretch goals, I'd be tempted by some accent colours (perhaps the orange of the original 'f' keys, or a blue, as used on the SX-64 (or both
They would give good options for buying a couple of colour-ways & and swapping out keys - I'm thinking along the lines of the 'mito pulse' keycaps
featured on Drop, for example.
Cheers & goodluck!