I think the proportions are a bit off...
I always pictured Shizu to be taller, but now she feels like she'd be the same height as her kunoichi trainees.
Really?
She's a fantasy barbarian type that can drink gallons of alcohol and dressed in DQ3 warrior bikini armor when adventuring.
Personally, I think she'll be fine. She's hot, has money, and her shit together for the most part. If all she wants is a monogamous relationship in a setting where that's not normal, that's honestly not that big of an ask.
Doesn't the story say that a lot of adventurers can't even get past the forest because they get elven wives? If the guys in that world are that easy, she'd have no problems if she actually took dating seriously. Seriously... all she needs to do is relocate off of Lucidia, and she'll bag a guy within a week. Even if she stays I doubt she'll even have to wait a year, even as lackadaisical as she is.
The two solutions to the problem you've found from what I've seen are from MGE and AppleRooftop.
AppleRooftop does something similar to what you're saying. They have poses and animations for combat, and on your turn when you're the aggressor it animates you thrusting and dominating, and on the enemy turn it animates them thrusting and dominating. It's obviously a lot of work, so the animators limit themselves to 4 frames, which is barely enough imo XD. But it's still A LOT considering all the animation needs.
MGE just... poses the characters in a way where you can't assume sex position. Catgirl "could" be doggystyle or reverse cowgirl. You can't actually make any assumptions based on the art because of the way it's framed and drawn.
Imp "could" be missionary or cowgirl. You can't actually make any assumptions based on art.
The preview for the holstaur could be mating press or doggystyle. Can't make assumptions. etc etc.
There was a conversation there recently about how the addition of animations actually negatively impacts that design decision but mods power-tripped and removed the convo.
I assume MGD could take the MGE approach since the CG is very limited, but that would require a lot more creativity in how the poses are framed, and it might not satisfy the fantasy of a lot of scenes in the game. Like... Elf CG makes a ton of sense if you consider how it's supposed to happen normally in game.
I'mma be real with you man. I genuinely don't see it.
It only looks like cowgirl to me. Maybe it's because her legs are going down instead of up?