you cant dyesub the spacebar right cuz its ABS and not PBT since they can't do spacebars as PBT at Signature Plastics.
I'm still down with the idea on the Backspace and the rest of the rainbow.
This is correct. This has to be dye sublimated, and you can't dye sub on ABS so a spacebar is impossible. In addition, we'd have to wait for the universal spacebars which is going to be a while. Was a great idea though, I'd do it if it was possible.
You cannot do dye subs on black, so that leaves us two color options:
Poptart on Blue
Poptart on White
I'm good with either, blue would go more with the original scheme of the nyan, but white would go really well with other sets (Portal)
Likely color codes for them would be WFJ for white (same as Portal) and BCT for blue (\KL set).
I'm willing to offer them separate so that those that don't want the rainbow don't have to get it. Both will get enough since people will likely be getting many rainbow keys.