Not so much on your own. I subscribed to the thread as I am looking into electric options and interested on what this thread may bring. That doesn't help you too much though.
Horny Wombat Brewery (345 McDonnell St Redcliffe) do refills and their website says they're open until 3pm. They did my 6kg bottle the other month and are reasonably priced and friendly to boot.
My last coffee stout I put about 50-60g of ground coffee in cold water (boiled and cooled - about 500ml) in one of those coffee press doohickies (for a 19L batch). Left it overnight then added it to the fermenter a few days before putting it in the keg (I was adding other things as well so...