Sounds good then. Many (most?) people have their chickens locked up at night because their runs aren't predator proof. If they can always get to their run they have the space they need.
I think you'll be fine with the kids up in the coop. They can skip the outside part for a week or two and be none the worse for wear. Zorra didn't take the 2015 littles more than a couple of feet from the door from the brooder into the alley the first week. Slowly she took them a bit farther but we had to encourage her to get them outside when they were, I think, 3 weeks old. The 2017s took themselves that distance (in the other direction) by about then.
When they start getting more adventurous, you can be the mama hen that makes sure they know how to get up and down the ramp. Make sure they are back up in the brooder space when you aren't there and I think you'll find they learn it for themselves pretty quickly.
I think you'll be fine with the kids up in the coop. They can skip the outside part for a week or two and be none the worse for wear. Zorra didn't take the 2015 littles more than a couple of feet from the door from the brooder into the alley the first week. Slowly she took them a bit farther but we had to encourage her to get them outside when they were, I think, 3 weeks old. The 2017s took themselves that distance (in the other direction) by about then.
When they start getting more adventurous, you can be the mama hen that makes sure they know how to get up and down the ramp. Make sure they are back up in the brooder space when you aren't there and I think you'll find they learn it for themselves pretty quickly.