This should be interesting !
I can match all those licences too, and maybe there is a common sense one in there as well.
I was going into Cairns many years ago. Daylight. Cavok. Two aircraft only. Me on short final in a B737; light aircraft just departed and giving his life story on the radio so neither the tower or I could get a word in.
Me: thinks..I haven't got a clearance to land but if I go-around I'll rapidly overtake this git in front of me and there aren't too many options for manouvering to the south of Cairns. I think the safest thing do do in this particular situation is to just carry on and land. So I did. During the roll-out lightie eventually shuts up and tower says "xxx clear to land". No great drama and end of story.
So for the poll ..."In a non emergency situation would you land without an ATC clearance?" YES - if it is the best option available.