I've been planning how to use the new lore tags.
I think it will be a mistake to treat crossgender like incest, and should remain separate from its lore counterparts. This is because lore tags can be gender compliant (using the genders visible in the image), or not gender compliant (the gender being portrayed is different than the gender that the character is supposed to be). crossgender and crossgender_(lore) could be used in the same image.