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Just like any man Beth, the best way into their heart is through their stomachs!
Make him up some special goodies just for him, and see what happens. Use the quarantine time to good advantage, and if you have the time, spend at least a half hour every morning and every evening in quiet companionship with him. Nothing demanding to start with, just quality quiet time. As he becomes more accustomed to you, you can then work on him becoming affectionate if possible.
With any other breed, I'd say that even at this age, you would have an uphill battle all of the way. But since we're talking Delawares here, I think you probably stand a very good chance of getting him to be, at the very least, approachable. That's not being a pet, but it still beats the heck out of what I went through with Griffin.
If you have the ability to keep him separate from every one for an extended length of time, you could work on him even further. It all depends on him and how he'll respond to you and his new surroundings. But once he goes in with his girls, all bets are off. I seriously doubt you could get his attention long enough to make any kind of real progress towards him becoming a "pet" rooster.
No matter what else happens, you'll be getting a beautiful boy to help with your own breeding program. If a "Pet" Delaware roo is what your heart desires, you could much more easily accomplish it by starting with a chick and raising him up to be a pet!