there are plenty of people that have chicken tunnels, sections of chicken wire connecting secure runs to other foraging areas. Chickens can be tricky to herd from one spot to another and are prone to going every which way so tunnels can work well.
I always like a secure coop and run with further access to a less secure area or free ranging when someone is around. I understand wanting to keep them safe, so that's why I recommend a cheaper less secured run addition, whether permanent or temporary. I personally free range my birds totally because I think in the end their quality of life is better even though occasionally I lose one to a predator. That's my personal choice and I don't recommend it for everyone.
I think you said your hens recently began laying. I'm assuming they are moody teenagers, who often become a bit more aggressive for a short time, then calm down more as they mature.
You can also provide behavioral enrichment by digging holes for them, adding flock blocks, scratch, food scraps, grass clippings, clumps of sod, and anything else that makes them peck and scratch. Your current run doesn't allow them to fully express some normal behaviors like taking dust baths.