Actually, HT didn't do the Xenomorph several times but just the one, I believe -- "Alien Warrior" from Aliens. and it's rare, and it's expensive. ZeroDelta is quite right that the ostensibly 1/12 Alien Queen works. But IMHO the best way to go, which people seem to have forgotten about, is the McFarlane 12" figures (upscaled from 6"). The corresponding Predators are much held back, I think, by the lack of fabric, mesh etc as they are obviously fully sculpted figures (although there, the forgotten hidden gem is the Stealth Predator, made in fully transparent plastic). But lack of fabric parts etc doesn't affect the Aliens. I wish they were a little bigger, somewhat better articulated, and less at risk of the plastic having become brittle on some -- but still IMHO those 12" McFarlanes are still the best practical option.
https://azzraelblogg.wordpress.com/2014/01/12/review-mcfarlane-12-inch-alien/