Update on the hen transfer: I took 2 hens from the main coop in the evening and put them in with the lonely rooster in his separate enclosure. I had to move them one at a time and the first girl panicked for a minute but settled right down. I got the second girl in and they were both fine immediately. The girls are hanging out with each other and the lonely roo isn't lonely anymore. Everybody seems to be getting along just fine today. I'll keep an eye on them, just the same. Thanks everyone for your kind advice! I can tell this is going to be a great place to share experience and knowledge.