I am kind of playing devil's advocate. I don't think any of that is a good idea. You're basically gulaging people at that point, which would be a good comparison -- did those guys get their money back? There was a thing on HN about how people in England with Norman names are still wealthier than those with Anglo-Saxon names about a millennium later. Now that was a conquest.

edit: they claimed to control for "skill" and inheritance (which should cover some of the genetic component) but I don't know how well as the paper is paywalled