Tomtommom-- hmm. Not sure what to suggest. My 3 older birds act like they owne the place and harass even the tom turkeys , pulling out tail feathers as they waddle along chasing the toms. Perhaps they need a little encouragement to get out on the grass. Can you fence a small area to show them the idea??
THe benefit of broodies is that the mothers showed the 14-15 ducklings around for the day and returned to her coop at night. She did all the work. BUt initially I had to show the first birds the outdoors ( brooded in the house ), then in the morning I just left the door open and they made their way out to the porch and yonder. Not ideal giventhe amt of poo they left onthe porch but it was a beginning. lol
They're young, 11 weeks old, only had them 3 weeks. They'll warm up, I'm sure. My chicks raised by a broody are the same way, wont come near me.

I like broodies because they do all the work and the chicks learn chicken things from day one. But incubator babies are tamer.