I had some rough times trying to keep my guineas with my chickens. It started out ok but when the guineas matured they started running my roosters relentlessly. They did their very best to kill every roo on the lot.(especially my barred rock, I assume it was because of the similar coloring) I was able to separate them and it ended up having to keep them apart. They were never allowed to free range together.
Good luck, and let us know if you are able to do it successfully.
Good luck, and let us know if you are able to do it successfully.