You've done a great job!
I do liberty with my gelding, too. I started out with a halter and a lead line, but now I do most of the work without them - however, still in an enclosed outdoor arena, because he sometimes tends to drift away in case we lose the connection. It is a really enlightening experience to achieve the connection and maintain it during the training. I have also started riding him tackless and, as for now, we're doing pretty well, although some things have yet to be refined.
I have come a long way, to surrender my shadow to the shadow of my horse.