A rooster, in some cases, will TRY to protect his girls. some will, some won't. But I hope your little rooster will be okay. However, if no one will be living there, and the bantams will be out during the day, they won't last long. All the daytime problems, raccoons, etc, will be able to get over the wall, plus the hawks, etc, who will come down from above. A bantam rooster would have no chance against a hawk, no matter how good his tiny intentions are. As someone noted, their rooster gave his life to save his girls. This can happen. The hawk will get the rooster the first time, then when he is hungry again, he will pick off the hens one by one, also. One thing is that a rooster will sometimes cackle a warning, and you can run out and see what is wrong, but if you don't live there, that is out. Also, if there are bushes, or other things the chickens can get under, sometimes when the rooster sounds a warning, everyone will run to get under something and hide. A bush with low branches, etc. However, (and I speak from experience here) with no one there to chase him off when he gives a warning, the hawk will simply land and walk under the bush to get his dinner. I have a chicken pen, 6 ft tall, with netting over the top to keep the flying predators out.
I sure wouldn't want chickens until I was able to live there. Good Luck.