Yeah I also brood outside (though I do it in the run) so that 1-2 week see-but-don't-touch period where the adults (in my case, all hens) get used to seeing the chicks, the chicks are growing up in full view of the adults all day.Some people like to wait a few days but I put my chicks in the brooder in the coop straight from the incubator or post office.
To me the advantages with this are many. They grow up with that rooster which should make integration easier.
Hiding spots via clutter, as well as at least 2 feeders (to prevent any food guarding), are the way to go especially when introducing chicks to older birds.When you put them together provide hiding spots that are not traps for the chicks to get away from the roo. They may not be needed, but have them just in case.
One additional thing to be mindful of, clutter/obstacles need to be placed so there's no "dead end" where a chick can get trapped - there needs to be 2 exits of more from each item. For me that usually means that clutter is placed away from walls, so the chickens can fully get around them. Anything that sits by a wall or a corner needs to have extra exits cut out or provided.