For that number and if you want to release them it might be better to put them under a broody bantam if you can get hold of one. If you use a small secure coop with a run on it, you can then take them to wherever you want them to be released and when they are old enough remove the run so they can wander about but come back to the bantam for a while, then take her away. Alternatively if you incubate them then you can try and get a single cock red leg to adopt them. (If you have any around you!) Find a barren cock or pair and put the poults in a pen, when they are off heat, in the adults territ