a harness is a harness is a harness. a plug and play harness is basically a jumper that goes between the factory harness and factory ecu with the same plugs. whatever system you pick you would wire to the PnP harness rather than the factory harness.
Your terminology confuses me, will the xede be plug and play or does it need to be wired to this intercepting harness?
To me it sounds like your making a harness extension so any piggyback can be spliced into it.
Please clarify.