Kaputar is ~20km away and - if you can't/won't get on the trad routes - has so much rock there surely must be some bouldering? (edit: neil beat me to it)
it's 3.5 hours to Warrabah, where there's clearly a lot of bouldering potential but I don't know of any development or if access is sorted
also 2 hours to the warrumbungles - brilliant major trad routes - and again so much rock there'd have to be some bouldering. and 1 sport route of Neil's there somewhere
3.5 hours to yarrowyck which is reallly good bouldering