I doubt if your Orpington and a game type of hen can live in harmony. A rooster is even more complicated. Only an older and friendly rooster is a possibility with one hen. Most (young) roosters need more hens not to overmate. It helps if you choose a rooster that is about the same size as you’re hen. I know Orpington roosters have a friendly character, so maybe this works good with only one hen.
Orpington’s do go broody and the roosters are great daddy’s in general. It would be better to have more hens with one rooster. But adding 3 new chickens to a solitary chicken at once is not a good idea.
The advantages of having one breed (only Orpies) is that their characters match and if you have many chicks you can sell them as Orpingtons. A heritage breed has more value as mixes.
If I was in your shoes I would :
- Fix a safe run / auto pop door.
- Try to find 1 ladyfriend, or a Orpington/friendly rooster for your solitary chicken.
If you find a hen now, that’s great . Add 2 more in spring.
If you find a friendly rooster wait for spring. Collect eggs to hatch (cool room temp/max 2 weeks) . Mark them with pencil. Lay 4-5 fake eggs in the nest. And give 7-8 eggs at once if your Orpy is a steady broody and stopped laying. Keep in mind that not all eggs will hatch and if you are normally lucky you get 3 pullets and 3 cockerels.
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These instruction are in Dutch for a predator proof run against marters, weasels, dogs, foxes and such.
- at least 1.8 meter /180 cm high
- bended 30 degrees at the top or make electric wire at the outside at 20 cm and 110 cm.
- tiles of 40 cm around or wire 50 cm deep.
- hwc 15 mm or ½ “
- strong netting on top.
+
- raccoons need a lock on the doors

, choose
- if the run is not a fort Knox, or if you free range, close coop at night (automatic)
I have a small roofed run within the coop area. The larger netted run is not fully predator proof. Therefore I made a automatic pop door between the coop and the larger run with some bushes in it. They love to sit under the Portuguese Laurel that has big green leaves all year.
I only let my bantam chickens free range when someone is at home/around. In 8 years 2 chickens disappeared and 1 was killed by a fox who broke into the run, probably around sunrise. This chicken went through the pop door into the run. I was disturbed by the noise. The other chickens were still safe in the coop. The fox panicked because (s)he couldn’t get out again. Never seen him/her again.
Over these years I always had 4-9 chickens (and sometimes a few chicks).