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A PBD is essentially the p-code part of the PBL with the source stripped off. A decompiler is certainly possible, but be aware that reverse engineering p-code probably violates the PB license agreement.There was an Aussie who claimed to have written one - you might try digging through the archived newsgroups. Based on his other posts I think he had the chops and was a white hat.
I'd be very paranoid about those Chinese products - like running them on a machine I was prepared to sanitize erase/overwrite the HD and reflash the BIOS afterwards, not having anything on it that might be of interest to a black hat, and not having it connected to any network.