Glad you had a better experience with colonics! A colema board would probably be a great investment for you as the open-system colonic is very much like a colema. Just be very careful...I recently learned of a death and three injuries that all resulted from using a Jimmy John...which is very much like the Libbey. If the rectal hose is inserted to quickly or two high it can puncture the colon wall. The death was the result of fecal material seeping into a man's perineal cavity leading to massive infection that eventually destroyed his liver. The FDA is currently investigating these systems very aggressively.
Since privacy is an issue for you I think a colema would suit your needs very well! ; )