This is probably past the time for changes, but just in case: Would you consider adding a 6U centered L9 spacebar?
It’s shockingly difficult to find, and it would go with so many L9 sets: the beige sets, Froyo, Kaiju, Analog Dreams, etc.
With the general availability of Des sliders and designers making true HHKB layout, it’s likely worth it to add.
Once again, thanks for running this!