We currently have a blank keyboard module available in both ANSI and ISO! For other keyboard layouts like Dvorak, it is technically possible, but we don't have a timeline for it.

I have a framework 13" and I replaced the keyboard with a black blanked keyboard. It was really easy to install, it took me ~15 minutes. I really like the look of it, and when I use it in public people think I'm a wizard.

Out of curiosity, do you really want colemak or dvorak keycaps? As a colemak user myself I found it useful to keep the qwerty keycaps in case I am dropped into an environment when the keyboard layout isn't behaving properly, since I no longer remember them perfectly. In all likelihood when using colemak/dvorak normally you aren't looking at the keycaps anyways.