Hey hey anyone reading this

So if any of you guys play Sims 2, you'll have heard about fixed templates- they're versions of the maxis neighborhoods that've had various glitches, mistakes, and bits of corruption made by EA cleaned up, making for a less janky playing experience. I was wondering if anyone more experienced with modding would know if it were possible to do something similar for the sims 3 worlds- I'm not talking about Ellacharmed's routing fixes (although ideally I would include those in the fixed templates if I were able to make them.) But, for example, in a base Sunset Valley, Agnes Crumplebottom and Erik Darling don't know each other at all, despite lore saying that she is his widow. In the game's eyes, Agnes's is just keeping some random stranger's grave on her lawn. I'd like to fix that, and make them recognize each other as ex-spouses. Or, look at all the dead sims in Twinbrook, who, even though they look like and have the same last names as some of the residents, are completely unrelated to them. Now, what makes me think this might be impossible is two things; one, that I've heard CAW does not play nice with worlds with premade dead sims, which would be a big problem, considering that a lot of the fixes I'm planning would involve tweaks with the dead sims, and two, just the fact that no one has already done this. I'd just like someone who's more experienced with modding to tell me if this is possible and what it would entail. Thanks!