You guys are also forgetting that Larian has done a short race romance in the past with Princess Aida in Divinity: Dragon Commander (though admittedly some people might not classify it as a traditional "romance").
Beast, a dwarf, can be romanced in Divinity Original Sin 2, also. I haven't done it in my playthroughs because I can't
not romance Ifan (and if I could I'd go for Fane, as he is my second favorite), but I like Beast a lot as a companion, and his romance is sweet from what I've seen of it online. He likely doesn't have as much overall romance-related content compared to the other companions, but he's still valid.