I'm doing something like this now. Not quite as strict, but I use a couple of mods (Insiminator and the hacked ambulance to turn community lots into hospitals). I have the handmaid get pregnant by the husband and then when she's in the 3rd trimester, I have her go to the hospital (which is actually the Wee Ones Adoption Center for which I redid the interior decor a bit). When the handmaid goes into labor, her baby is adopted to family, and I choose the wife's name. I use the relationship mod to sever the relationship from the handmaid to child and voila... the child belongs to the adoptive parents. Once that's done, she finds her own place and starts the process over. With the insimenator, there's no damage to the husband and wife relationship status since he's never actually cheated on her. The handmaid pretty much has the run of the house, but I concentrate on her, keeping her busy with cleaning, cooking, and gardening since women aren't supposed to read. I use the Book of Talent (I believe that's from MTS) to adjust their skills, and the wife is barred from the husband's office, where the computer and bookshelf are kept so she can't read either. I also have fertility potions (I can't remember where I got those from), and infertility potions for both male and female to make it a bit more interesting. For the mods I mentioned by name, a quick web search on each of them should get you links

I wish one of the modders by now had made outfits to fit the storyline. I guess it's a bit of a touchy subject since the women in the book, movie, and series are basically forced, but that's impossible in the sims, and with so many pregnancy and other mods, there's no reason for any of the Sims to be traumatized.