Nice discussion. As a lover of the new warlock class I'd probably be all in for creating a new pact where you limit the spells as desired to make it feel more witchy while giving a few new ones to replace it.
You can also play around with backgrounds a little to create a coven member / witch...
Way late to the thread but I'd jump in to say you can't really go wrong with Fantasy Flight Star Wars. It's my favorite of all the rpg systems that have ever been put out by far. The character build freedom is rather nice in my opinion.
The dice, once you get used to them are really very...