Parts are fine. Though, I’m guessing you’re getting an LS-33 spring to mod the JLF? I’d go with the aqua Seimitsu PS-15s. But, that’s because I’m a manly man, and I like putting some force in my button presses.
You can go many ways, I wouldn’t do completely different sets of button colours though (red white blue for example). Perhaps to keep the ryu theme going: a red rim/base with a white plunger swap? And the last 2 buttons solid white. White is a pretty safe colour.
If you don’t mind seimitsu you can also try some white clear buttons, they’d look pretty slick even if you don’t put artwork inside.