People do this all the time for different reasons. I'm not sure this is what you really want to do.
I understand some people don't want fertile eggs for their own reasons. I don't know what your reasons are. They may be religious or based on your world view or they may be based on misconceptions. If you want to chat about those we can, but I respect your right to have your own opinions.
If you put a rooster with hens, the eggs will be fertilized for over two weeks, some likely over three. I don't know what you plan to do with all those fertilized or potentially fertilized eggs. You can't tell which are fertilized without opening them.
In real life this doesn't happen all the time, despite some of the stuff you read on this forum. It certainly can happen. Usually this bothers people a lot more than it does the chickens, but it is possible there could be bad consequences from this.
If you hatch eggs you can get a lot of boys. What do you plan to do with those boys? You never know how many eggs will hatch to start with and you never know how many will be girls. It is usually not 50-50 when I hatch.
I understand the desire to hatch your own eggs but from what you said I think you'd be better off not getting a rooster and worrying about managing him. Life will be so much simpler and less stressful if you purchase sexed chicks and raise them when you are ready to replenish your flock. By the time you raise them they will be your girls.
If I were to do something like this I'd put him in a pen next to the girls. He won't be able to interact with them like he would if he was with them. That's not just mating, finding them treats or keeping his flock peace by breaking up fights and such, the things a flock master is supposed to do. Especially if they have a shady spot you may find they spend a lot of time across that fence in close proximity. I'd consider that a better life for him than being totally all alone all the time. Or you can keep two or more roosters in a bachelor pen so they keep each other company.
