I've got the same issue, my wife needs all the help she can get reversing.
Did you find a solution for connecting a third party camera into the Honda Infotainment system ?
I tried chatting with my Honda dealer, and the parts seemed to include a EX wiring loom for the tailgate, a very expensive camera , and different bits of plastic for the tailgate. Something like £1300 of parts, plus it would need to be fitted ...
I would have bought an EX if they'd have sold one with the 128BHP Sport engine ...