You can do 10g with a Grainfather.
Here's one I did. I just had to add a gallon to each fermentor at the end of the boil. And it can only be 4.5-5% beer unless you want to add extract, which I didn't. Limited options, but doable.
Lots of good info here. I went back and read it all, that was a year ago as well though too. A lot more to catch up on now, but I still would if you have the time.