What a good idea in reusing a feed bag for a lid!
When I purchased my bantam hen, they had her in a hamper in the living room with a towel over the top. It was all very cute and she cost $3. :love
The best advice is probably not to pet him. His mindset is probably changing and when that happens the hens are “his” and pets are probably perceived as threats. I had to start treating mine this way once he grew out of baby stage and he has been a great boy 5+ years now.