G'Day Gitsho.   It looks like no one else has done so.   I did have a look at trying this but I have the 'turn around' type.  You know, the one that swivels to the side to create more room.   I found there was insufficient room to 'get to it' if I wanted to replce only the bowl.   It appears I have to replace the lot due to mine being hard up against the bulkhead.   An interesting point though, I find things sometimes drop out of my vanity cupboard when I open same, falling onto the toilet (aftershave, deodorants etc).   Some of these things are heavy and have done no damage to the plastic toilet  (apart from dents and scratches).   If I did fit a ceramic unit I would be concerned about chips, cracks and possibly total destruction by said falling objects.   I don't know if that would happen, but it's an expensive way to find out.   For what it's worth.