Maybe you could find someone who would trade you already butchered roosters for some of your extra hens. It's generally much easier to find takers for hens than it is for roosters.
I agree on keeping as many hens as you can. I have one hen that is a superb layer, laying nearly everyday, never missing a beat. However....she is mean. She is aggressive with the others and bites me all the time. However I still keep her because she lays so well.
Central Illinois. But I'd want to trade 4 or 5 roosters for the same # of hens. I don't have a place to quarentine 5 seperate trades, so if someone near me has a bunch o'roos llemme know! I'd prefer not to drive more than 1/2 hr. I'm near Urbana
Seriously. If you can not keep that many hens, go ahead and put some into the freezer.
I don't see the advantage of trading good hens for mystery roosters where you don't really know how old, or what they've been fed, or anything about them.
You know your hens have been well raised and well fed and they are the right age to butcher them. I'd keep the ones with the best temperaments and I'd keep any that tickled my fancy enough to be the favorite. Maybe let everybody in the family choose their favorite to be a keeper.