Your mockups are somewhat reminiscent of the Speakeasy chips (on the BCC t-mold). Those chips use a common gray base with various 1/4-pie spot colors:
Using gray or charcoal as a base instead of black may give your set colors more opportunity to shine on their own, as well as provide a little more contrast. Black is a pretty strong color; sometimes overwhelming when used in large quantities. Using a white inlay (vs gray) will definitely change the look of the chips.
Beautiful suggestion! I'm very close to the Inlay design being completed so I'll post pics when it's all ready. I have always liked that Speakeasy set a lot and not sure why I didn't think to go in that direction... thank you!