If you are set on a minimalist rig, others on here can advise you more.
But if you would consider something like the HOG sidemount rig, they are currently on sale for $200US/$263AUD.. you just have to worry about getting it there to you.
But if you would consider something like the HOG sidemount rig, they are currently on sale for $200US/$263AUD.. you just have to worry about getting it there to you.