The more I think of it, what has been done in FairCoin is an address swapping mechanism, they use
http://wafflepool.com/ (witch pays in BTC). So if you swap the HBN address for a BTC address and use wafflepool's infrastructure, then when the amount of BTC is big enough, you buy HBN and then distribute it back to the matching HBN address.
I think it's brilliant and could be done fairly quickly. at least it could be a start.
That's the system the Zeitcoin devs implemented yesterday. The price has since doubled. Though to be fair, it did double from extremely low levels.