This was my solution. I built this stand out of strips of 1/2" Sintra, an expanded PVC foam sheet material used in sign making. It is tiered like a staircase, and I sized the "treads & risers" to fit the Tamiya 10ml bottle exactly. The number and color are visible just above the lid of the bottle below. It's split into two sections: Gloss on the left and Flat on the right.
This image was taken just after one of my semi-annual cleanups, trust me, it is rarely that clean!