why not just use your hybrid?
I tour a bit on an '90s Rock Hopper.
I set my son up for a light (lite?) tour on a KONA Jake the Snake: https://goo.gl/photos/kJEHaURzneL2US9b6
- small frame bag and rear rack.

I have a friend who tours on his hybrid - a GIANT... somethingorother: https://goo.gl/photos/W2h1NDnv2u1wmPNG8

Personally I don't think I'd want the rackless bike-backing setup unless I was on single track alot. Otherwise I 'think' having that loooong seat pack waggling would be annoying. And aesthetically.... well... looks weird.

hope that helps or gives some ideas.
Happy Trails!