My first suggestion was to change your diet. However, after reading the posts and your responses, more questions than answers come to mind. Removing the old toilet and sealing a full black tank for any period of time is IMO, not a very prudent decision. My take is you have a leaky toilet seal therefore no water stays in the bowl. It sounds like you rarely, if ever empty your black tank. Poop stinks, poop with no water stinks even worse. Water evaporates, the black solids do not. Your only solution sounds like lots of very hot water to dissolve what you already have in there, a through cleaning and a new seal in the existing toilet. Your idea of replacing what you have with another toilet is a bad idea. Yes, it's a messy job but it's also your poop, so as has been mentioned, Suck it up, buttercup and Git-r-dun......Dennis