Mostly right. I accept the theoretical possibility of a self-evident belief- before learning of the Evil Demon argument, for example, I considered 1+1=2 to be such a belief.

However, a circular argument never is allowable, no matter how wide the circle. Without ultimately being tracable back to self-evident beliefs (though these can be self-evident axioms of probability, at least in theory), the system doesn't have any justification.