The trick is not to have inputs that you can put in that way, so on a simple level this means having only one input and taking the inverse of it to drive the other half of the bridge. Look at a chip like the UC2714, the data sheet has a block diagram of the sort of thing you need.
So basically the two inputs become "direction" and "enable", instead of two logic inputs, right? Guess I have a small amount of redesign to do, then - but no problems...
