Not to break your hopes but I find that pretty much impossible to happen in this game.
I wouldn't bet on them doing a full dom route. But they already made the Dick Pope a gay futa that bottomed for the MC. Clearly the devs are willing to do some role-reversals from time to time. As for Mallory they didn't do a role reversal because it would be dumb to have it in her route. She's a religious fundamentalist and she won't take any sass. So the devs don't put it in her route.
I think a holiday special with a futa in the free male states is possible if the fanbase feels there is enough futa dom content that a futa on male special won't throw off the ratio for futadom to everything else. And they release it on April Fools.
The other possible scenario is a crossover event or collaboration where someone is allowed to work with the devs on primarily their own game set in the futadom world. So they would write and develop the game themselves, maybe have the devs read it over and tweak some things, and pay the artists to draw some visuals and animations for it.
If I ever become rich enough, I'll personally commission this myself. Not commission the main team, but a side team to do it.