Why not just keep them until you can process them? Just dont put them outside until late morning each day. And why not get just pullets? Its only a few cents more per bird at all the hatcheries i've shopped at.
I know this is not your question, but if you get 8 true straight run chicks, the following are the odds of what you get. All Male - 1 in 256 or 0.4% 1 Female - 8 in 256 or 3.1% 2 Female - 28 in 256 or 10.9% 3 Female - 56 in 256 or 21.9% 4 Female - 70 in 256 or 27.3% 5 Female - 56 in 26 or 21.9% 6 Female - 28 in 256 or 10.9% 7 Female - 8 in 256 or 3.1% All Female - 1 in 256 or 0.4% Just for info.
If there isn't any way to sex them--here are my suggestions (works best with 3 day or older chicks). Pick the ones with smaller, delicate legs. Don't pick any that are bumping chests. Don't pick the ones that stick their head up out of the bunch first and stand erect. Don't pick the ones that have the prettiest feathering! I did this twice! and still have a roo even though he was supposed to be a sexed pullet Pick the ones that kind of waddle still. Best of luck, and hope all your roos are nasty, so you can part easily with them!
I ordered from Ideal I have 9 roosters and 9 Hens, but I kept all of them and have had them for months now and they all get along kinda weird huh? once in awhile they play fight but never really hurt each other.
I lucked out and found some sexed chicks (two different types of sex linked). No worries on the rooster situation any more...phew!
I am about to do the same thing, I am picking up 8 silkie chicks today and am worried sick because have a terrible odds when it comes to picking hens....I have an adult silkie at this time that I need to place cause he fights with any other rooster. I rasised him from an egg and hate to place him cause he's a sweetheart with people and the hens but a nightmare with my frizzle roosters. So good luck to you !! I was thinking of a rooster pen but doesn't that seem mean to do, to keep them from hens?