Google Shopping Colour Attribute Without Creating Variant

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Most of our products are being disapproved from Google Shopping because they're clothing and they don't have a colour. The Shopify support response is to create a variant on the product for 'colour' and then hide the variant on the frontend. Seems kind of messy and for some products may be hard to stay within the 3 options, 100 variant limit if we do this.

Has anyone else found a creative solution to this? Maybe an app that allows the use of a metafield for colour which gets pushed to Google Shopping?