- Close them as duplicate on Programmers
- When Programmers will be out of the Beta, import\merge them.
- Reopen them
WHY? What problem does this plan solve? What actually is the problem you're addressing?
That users on this site "steal" reputations from "original authors"? Many of those who were active on StackOverflow, and answered those questions, don't care about this site, and about whether thy have any "rep" here. If a user borrows the answer directly, he just may link to the original one. Even if StackOverflow was the place where the answerer first learned about this, it's not a problem: there always is such a place.
That people here duplicate a work that's already done? Well, I don't think that dozens of those who answer the questions you linked are not enthusiastic about it...
Moreover, your plan suggests that we should ban specific topics here (though temporarily). But we opened this site to ask and answer such questions, and banning them contradicts the purpose.
My suggestion is just leave them as is, alive and not closed. When the time to merge comes, moderators will carefully merge the missing answers in.