While it should be a lower priority, I wouldn't dismiss inverted-colors out of hand. All the browsers can detect when forced-colors is active but Apple operating systems don't have a feature equivalent to Windows's contrast themes to activate it but do have an invert colors feature (only Firefox has a user setting to activate forced-colors at the browser level). And Safari is the only browser on iPhones and iPads.
But may not be a need for an inverted-colors media query, it would likely only be needed in cases where it's important for certain CSS colors to not be inverted.
You might find you also don't need a forced-colors media query, that defensive CSS techniques can avoid the need for specific rules for when forced-colors is active. The Sarah Higley link above is a good resource.
To be thorough, there's also prefers-reduced-transparency. "Reduce transparency" has broad support at the OS level but not yet at the browser level (not-Chrome browsers have concerns about fingerprinting). Day 103: the prefers-reduced-transparency media feature. If themes avoid using opacity or alpha channels in their colors, a media query for this is not needed.