So I am thinking of an off the wall solution to this problem. You see the problem is twofold. First is the odor. Second is I need a way to dispose of the waste as we don't have a septic system and I don't want to bury a drum and risk the fines.
So I am thinking about using a Thetford Curve Porta poty and placing it where the Stinky toilet is now. What would be involved in sealing the drain to the toilet in a manner that could be undone should I decide later on to switch back to a normal toilet?
This way I eliminate the smell and also have a reasonably easy way to dispose of the waste itself.