Well when flying a RNAV approach ATC will never clear you in such a way as to skip the Final Approach Fix (FAF), I’m not 100% sure how the real G1000/3000 will react. My experience with other Garmin systems is that they don’t like vectors to a FAF or flying to any final approach waypoint skipping the FAF, this screws-up the waypoint sequencing and therefore you might need to use the “activate leg” feature. It might want to intercept the FAF and pick-up the approach from there, I’m not sure.