Yes, it would use less wiring.
But both CP-e & us have made sure it can't be reversed for other units.
We can supply PNP's for another unit soon. But I'm unable to say which one it will be until the launch date has been confrimed.
Believe it or not but no there isn't as the other suppliers have always sold them as a cut in harness, unless they can buy the plugs.
The thing that amazes us is so many people steer back to the products that have been moded to run on the MZR's instead of buy a unit that was designed for them.
In the tests we have done the SB2 has always out performed the others. Even on the BMW's the SB2's have a proven result. But Mazdas are still looking for another option when there's a unit that's on the market now & has been proven.

Just to play devils advocate, if the SB is so good, why do the Mazda Targa cars still run Xede's ?
Like I have said people sicking to products they know

Just stirring....from my research into this area, I think both products have their own respective pro's and con's, as much as I support cp-e I will be running an Xede, simply due to the local support and knowledge for the device, in the US on the other hand its the complete opposite.
Only problem there is that the factory ECU plugs & pins are a proprietary design, owned by Mazda and are not available for purchase. I believe cp-e back engineered the plugs to suit the SB, hence the reason they made the harness unique to their product.
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Gaining access to a wiring harness will give you one side of the plug.
But you will need to destroy a ECU for the other side of the plug.
That's going to start costing big bucks, just for a little harness.

Or find suitable replacement pins
pins arn't a problem, you can pick them up anywhere.
How do you hold the pins in & stop them shorting out.
You need the plugs to hold them.
We have been working on this for a while now its not as easy as most thing.

If youre just extending the individual stock wires that are relevant to the Xede, its simply a case of matching the male & female pins with a short length of wire that can be cut, or tapped as necessary, a bit of heatshrink over the area the factory loom female plug and the new male pin connect and Roberts your Fathers brother.
A full PnP harness is a very different story though, and no doubt a very costly and time consuming exercise, I know that PG offer one and it costs a small fortune.