About to purchase a used clubman and I've been doing a lot of research. I would really like to be able to retrofit a backup camera and carplay into this car, however it seems like I would need a car that had factory nav. The car we're looking at doesn't have factory nav and instead has the red/black small display. Is there a way to retrofit to cars that didn't originally come with NAV?

So far the only thing i've found is this...which seems legit, but hard to tell.
Sigma Car Stereo Upgrade

Would appreciate any buying advice and upgrade options on a 2013-2014 R55.