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.