I love this method. Any reason you couldn't replace the oil with butter?
There are lots of canna butter recipes on our site too. Check out the Kitchen section for a few.
I made my first batch of butter and oh mama is it STRONG! Made 2 lbs. and still have lots left I can only use it when I have spare 6 hours to sit around and go OOOOOOooooooOOOOoooooooOOOOoooooo!