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Most gendered languages have 2 or 3 grammatical genders (masculine, feminine, and sometimes neuter) with gender expressed in nouns, adjectives, pronouns, and verbs. Depending on the language it may not be practically possible to add a new gender (or 20 new genders) due to the sheer number of grammatical forms you must memorize just to handle 2 or 3 genders. These are not trivial changes. In English, learning someone's pronoun might mean learning three words. In another language, it might mean learning literally hundreds of new grammatical rules. Instead of asking 99% of people to conform to the linguistic wishes of less than 1% of people, why not just expect them to find a solution within the existing language?