If you're only working part time then i don't think being able to get to a crag in under 2 hrs is the most important consideration. Gramps and Araps definitely trump the Bluies for quality.
If you want to work in your field you may also consider going down the FIFO route so you could be based anywhere....but the work environment could be pretty remote. If you want to stick to one area then have a look at working on something like the NBN (National Broadband Network) for one of the big contractors such as Transfield. Not sure how easily you could do something like that part time.