Can I order a one-off keyboard with custom color or engravings?

99.9% of the time, no.

The only exceptions are for custom variants of existing cases with differing engravings or colors which will be used for spreading publicity of the custom keyboard community; for this to hold true, the commissioner must have significant publicity with a positive reputation. For such requests, please contact ai03 via Discord (join the Discord server here, then send a direct message to ai03#2725) or via email (admin@ai03.com).