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That's quite a dilemma, if they take 2 years to reach fertility, and meanwhile he's a PITA. Is there any way you can maybe make him a nice roomy pen, away from the chickens? Maybe a movable tractor? I know exactly what you mean with a hard to find breed of anything, you don't want to let go of one until you've at least been able to get offspring from them.
Is he attacking the chickens, or trying to mate them and squashing them? I knew somebody who had a big Tom turkey who squashed some chickens, trying to mate them. Sometimes these birds aren't too bright.
As far as butchering age, it's probably already past when he'd be tender, but I found with turkeys, that long slow roasting solved that problem. They were delicious. I've only even cooked one goose in my life, it was a store-bought one, years ago, so I don't know if the same would hold true. I'd expect it would, if they tend to have a lot of fat. Maybe somebody over in the recipe section could answer that for you.
If all else fails, the crock pot or the pressure cooker will tenderize anything. You could have goose tacos and pot pie. Or grind it up and have goose burger.