I just now watched AylivJoi videos and there just alright even though I’m not really the biggest fan of ai artwork myself it’s understandably a necessary evil for interracial JOI’S and also despite using ai almost every time I see someone make ai interracial artwork on say pixiv they always use same artstyle that’s kinda unappealing in my opinion which is pretty strange like me personally if I was using ai I’d just try to replicate the source accurate artstyle of what said character comes from but hey what do I know. although I’d say my favorite out of the 3 interracial videos AylivJoi made it would be arcueid from tsukihime since you don’t really see her a lot so that’s hella respectable. But it makes me a bit sad knowing that AylivJoi is the only one is making content like that. Cause similar to what you said would it be hard for like say joigang in there gangbang videos to have one of the numbers be a person of color. But guessing by the joidatabase comments and downvotes people aren’t a big fan of interracial unless it’s ntr so I don’t expect many other creators to make content like that smh.
Arcueid has like zero good nsfw art, believe me, I checked for all the tsukihime girls. All the other OG Nasuverse girls lack art too. At least compared to FGO. All Aylivjoi vids are custom commissions too, so I guess you're not alone in feeling the way you do.
Joigang could have easily done this in at least three of their videos. Considering they are known for being oh so inclusive, it is bizarre. They can do blood play and sounding, which can actually hurt you, but a little melanin? Nah, too cringe. They could have fit this idea in the gangbang lottery part 2 with Honoka, Tifa and 2b videos. Those characters have a lot of animations with black characters. All of those were gangbangs too so it wouldn't be too intrusive either.
If you want more black pov you really should learn how to photoshop existing art. I believe VTubers Blacked does this as well for some of their vids. I'm sure you can get someone to do it for you if you just hand them the art you want to use. Of course this requires you not to be broke, but them's the brakes. Commission rates are complete garbage.