Oh well

As you cant have chicks, you may as well try and get them to go un-broody. Because as you've found out they don't lay eggs while they're broody and can be a bit of a nuisance >.<
To get them un -broody keep removing them from the nest box, you need to make sure that they are in a place where they can't sit on some nice hay/straw/sawdust and go broody. it sounds mean but when I have broodies I don't want I usually remove them from the group and put them in a metal dog crate with a mesh floor. This means that the air comes up underneath them and cools them down. Making the broody go un-broody. this may take a couple of days so make sure they have food and water available to them. If you want to speed up the process you can dunk their bellies in cool water a couple of times an hour and then place them back in the crate. This makes them cool down quicker.
Broody hens may sort themselves out, but they will loose alot of weight because they're sitting all the time and this means they won't lay eggs for agessss.
Hope this has helped, god luck sorting you hens out