Just some insight from someone from Canberra. Despite it having a good local comp it will always be rugby union and league heartland. The population of Canberra that might be interested in supporting AFL are very transient in that they are living in canberra for work (public service or defense) and if they are from another part of Australia there is a very good chance that they would already support another club. The afl tried marketing the roos as a Canberra team a while ago and couldn't give away memberships....
Sure you're from here?