No need for anything like that.
What you need to do is warm the bowl, stones and nibs to about 115F and then add the nibs slowly until they start to release some fat. Once that happens you can go a little faster until all the nibs are in the grinder. This should take about an hour total to fill it up, and then in about another half hour you should have a batch of usable liquor. The Santha can fit about 8lbs total. Why do you not want to use cocoa butter?