For cams, pick up a pair of single AVCS cams and plug the AVCS holes. They have the same duration as your EJ205 cams, but have 1mm more lift. The phasing with the non-avcs cam gears sets them for higher rpm. If you are going to do the 2.3, that would help the heads flow better up top.

As for the concern on aftermarket cams, that is something to be aware of, but there is no where near any resolution yet.

One other thing to think of, as shift point seems to be the main root of your looking at the 2.3 de-stroker, would be to change your final drive. Once you take the AWD out of the equation, it is pretty easy, and that may give you a better set-up overall... It would at least be worth looking at.

Available options are 4.44, 4.11, 3.9, and 3.7.