Well, it already has half of all your suggested.
1. Your Third suggestion are already in game, it called Breeder Pill, can be bought at medical and Milk factory perk that you suggested, If you got lactation you can produce milk until you stop milk it. And there are a lube
2. As well as your third suggestion, your fourth suggestion is already in game. you can sell your semen and your milk at medical too
It doesn't like, I don't like your suggestion. Your first and second suggestion is great. You can try your first suggestion by mod if you would like to see it before it gonna be vanilla. Your second suggestion is what I care the most, it gonna give more of rpg elements. For an hour I think you doesn't explore enough to see all of it so keep it up