It is best if you can get a hen to go broody and then have her raise the keets, she will do a much better job than you ever could. There is a huge problem with them getting eaten in trees, predators in guinea are different than predators in the US.
I've been told that they can be surgically de-squaked but I have no idea how. You can raise them in a green house but you must deal with the mess, deep litter would be my vote.
Also, if you raise them with chickens they will pick up bad habits (like scratching) from them, but also good habits like going into the hen house to roost.
Goodluck with the next batch.
