I tried this also, using a kids water-pistol stand-in, although my own truck isn't the ideal stand-in (too small back there to replicate). I could do it with my left, if i was tight in against the door, not using the 'sights' - i was still leaning forward, at an angle. It is possible that the brass would clear my face - if i held it out closer to the drivers seat, than myself - it all came down to the angles. Right-handed, my wrist reached too extreme an angle to make that a logical position - either gangsta-style, or the proper method of shooting. 'sights' were entirely useless. .
I guess we'll all watch it shake down, in the coming days.
IMO.