I like Kenneth's design and model a lot, but this has nothing to do with "canonizing" the Kelvin.
The Kelvin is - or shortly will be - canon, just as it is. This TOS-ish design is not
canon, and there's no specific reason to think that it ever will be.
What's being done with this variant is just redesigning the Kelvin out of TOS components in order to make it fit more comfortably with what we're used to seeing these ships look like on TV. Canonicity simply doesn't enter into it.