When did I mention a craftworld? I was talking about corsairs and/or drukhari captured and enslaved by the inquisition. Corsair fleets are thousands strong. You could come up with any reason why a few hundred were captured and enslaved by the inquisition. If you’re worried about them “running around the ship” then thats more an issue with how Fatshark set up their hub, isn’t it? A more complete game might have different HQ areas for certain classes. Maybe the Xeno would be in their own heavily guarded wing. Maybe they’re in the same areas as everyone else, but armed guards follow them around and bark insults at them. There’s no reason not to get creative here.
Right now I’m playing 40k Rogue Trader’s alpha. I literally have an eldar in my party. I’m meeting with high-ranking officials who engage with xeno semi-openly. I have a trader who specializes in xeno-artifacts on my team. Yvraine saved Guilliman’s life. The tabletop RPGs have countless examples of humans and xeno reluctantly working together. Again, there’s a spire on Necromunda dedicated to xeno-diplomats.
The “purge the alien” meme is just the surface level, dude. It’s what the Imperium would LIKE to do, but it’s not feasible to be at constant war with every galactic superpower at all times. That’s a recipe for disaster. The only people in the Imperium who think like you do are called “mono-dominants”, and they’re pretty much universally despised because their politics are insane.
Your excuses don’t add up. The idea that 99% of the time it fails is ridiculous and not based on the books or codices.
Radical inquisitors don’t get excommunicated “very often”. That’s nonsense. Radical Inquisitors have massive amounts of power and entire sector’s worth of resources. One of the basic aspects of Inquisition is that it’s fractured and divided. It’s very hard to get a sizable number of inquisitors to agree that one of their colleagues is a heretic. Even then, the suspected inquisitor might have hundreds or thousands of allies across multiple sectors who would say otherwise. Radical Inquisitors are common enough that are considered one of two moral extremes in the RPGs (the other being puritan). In fact, most Inquisitors become MORE radical as they get older, because they lose their naivete. If you want to know what it takes to get excommunicated from the Inquisition, take a look at what happened to Kryptman when he discovered the Tyranids.
You also seem confused about the role of the Ordos Xenos and Hereticus. If anything, an Ordo Xeno inquisitor is MORE likely to kill aliens on sight, because that’s their job. It;s the other Ordos that are more likely to align with xeno, in a sort of “enemy of enemy” kind of way.
Back to Xeno characters, this isn’t nearly as uncommon as you make it out to be. The plotline of Dawn of War 2’s Eldar campaign centers around a group of Eldar in an uneasy alliance with an inquisitor (hereticus, I believe). I already brought up the return of Guilliman.
You’re also misunderstanding the scale of 40k. Sending a few thousand xeno prisoners to die fighting the enemies of humanity is nothing significant in terms of numbers. Eldar may be a dying race, but we’re still talking about a galactic scale here. None of this is “too big” or “too significant” to be feasible.
Corsairs also act as mercenaries for Imperials all the time. Usually under the table, but there’s nothing stopping an inquisitor from hiring a small fleet of corsairs to crush a planet’s worth of heretics.
So, in short, there’s no reason not to have xeno characters in the game, at least when it comes to kroot or eldar. There’s countless ways it could be approached. It has precedent in the books, the video games, the tabletop RPGs, and even in the game I’m playing right now (Rogue Trader). It’s silly to act like this can’t or shouldn’t happen, and it was silly for Fatshark to start us off without at least one non-human character.