Personally, I would wait until they are integrated with the other girls. If your older birds intimidate and harass them, you would likely have a very hard time to get them back in for the night!
Since you are putting them back in the coop, I would give them a week or so of the 'look no touch' thing and go from there. Some birds integrate better than others, so see how it goes. Make sure you are around for the first full integration day - it can get ugly very quickly if the chickens have a mind to.....
Having said all that - that is just what I do, others may do different and it works ok. No set rules.....