help with "more options" on product grid page

I’d like to have “more colors available” under products with options. Does anyone know how to do this without creating an exception for each item with options?

I could do this by just adding it to the image of the main product, but there is a bug that is being ignored in “bug tracker”. The first product variant shows up instead of the main image. If I added it to the variant, the first variant would all say “more colors available” in the shopping cart image.

Any thoughts on how to make the first idea work or a workaround the bug?