Do you have a white Choc by chance? If so you can dye the keys. Sadly there is not many source of 1.5 modifier key. You could try signiture plastics but unsure if they will have suitable color in stock and having them make some if not is very very very expensive. No one has that size of 5.x spacebar either. so dye is only option there really.
I ended up ordering the black version, but very interesting! I can see myself using rit dye for other projects.
What do you mean "dye the keys"? We can actually change the colours? :O!!
I read a post about spray painting the keycaps. Is there another method?
Don't spray paint your keycaps, I did this about 10 years ago and the paint was forever sticky, uneven and it eventually chipped off in places. Not good.
I believe with rit dye the dye actually penetrates the plastic in the keycap bonding it forever, but the key needs to be in perfect condition as small scratches will be seen. Another thing to note with rit dye is that it must be done with warm/hot water and has the potential to melt keycaps if not watched or done correctly.