What would be the prisoner's goals? Are there team sizes? Is there only one Karryn? Is it turned based? What who were?
Can steal the assets and maybe add a "multiplayer" element to it through the main menu, but the game design is probably going to take up most of your time.
I think most things are somewhat easily manageable from a surface level. Squads of at least 10 players with max of lets say 4 waves go against the heroine. As a prisoner you'd be able to tweak your group and shit.
Alternatively, making a single male character and having a softlock mechanic where a guy with a certain skill locks down Karryn waiting for other to join in and initiating the fight when either a specific threshold is met or whenever the guy wants. This would probably then require some core mechanics changes but it would be more interesting imho. Server management would become a problem (maybe?) since it would require much more individual characters. Ofc as you play you can level your character/characters and match against other players in your level group, or have dedicated servers. So yea, it's probably turn based.
Some additional goals could be set so that it doesn't become a monotonous game of just sexually or physically subduing either parties. Maybe something that would prolong the session could spice things up, since if you were to c/p base game into this scenario, it'd just end too fast.
Character customization is something you'd most likely be able to do, and this is something I'm hoping to actually see in KP, or at least to some extent. I'm aware that CC mod has this, but pregnancy is a turnoff for me so I never bothered with it a whole lot.
This is all off the top of my head mind you. I'm sure you could find inconsistencies if you were to delve into this idea. Both from players and developers standpoint
Bonus meme: "Karryn's Esports"