Wait a second. Wouldn't that amount to something like paying 20 or 40 million for Justice?
If you believe that Bosh is never going to play again, you'd pay $26 million (Bosh and Justise's combined salary) this season, and then he'd be off the salary cap books for the rest of the contract, meaning you'd still get two years of Justise's rookie deal without any extra salary baggage.
I don't see such a deal happening, but I'd take that deal in a second. (Because if Bosh doesn't come off the books, that means he's healthy enough to play, so there's no downside there.)