To start, conversion of HIVE to HBD does not occur on the centralized exchanges. That is a mechanism programmed into the blockchain.

That said, if someone has to buy it, getting it off CEX is viable. Remember, the USD amount can fluctuate so the higher the price, the more HBD that can be created from each HIVE. This is something that means collateral demage equals HIVE demand once the present HIVE is spoken for.