This looks so nice!
Please consider a few things:
1. Add R2 Ctrl for HHKB users like me
2. Add 2x R3 1u alphas for international users
3. Add 2x R2 1u alphas for international users
4. Add 3x R1 1u alphas for international users
5. Add 1x R1 1u Fn key
2,3, 4, look here:
This will make the set usable for most of the world without specific support per language.
Of course symbols on numrow and such will not match but at least alphas will look good :-D
Thank you!