Never say never. Once you've done most of them and only have a handful left it will nag at you until you just HAVE to do them. More importantly as you play other aspects of the game, your overall level will improve significantly, and the trophies will become easier.

I think the Airbraker trophy is Zone 50. As with Zone Zeus, head straight to Syncopia. After a bit of practice it's a fairly easy trophy to get, not much harder than doing it normally to be honest.

Beat Zico was the one that I struggled with, but now that I've done it once I've found it easy to beat. Got down to 30.44 yesterday and will aim to get a sub-30 time soon. Need to nail a couple of the more advanced BRs first though.