The gall bladder 20 KO was my very first. I got it from a hammer lock, then just tapped GB 20 and uke was out. He said he felt it all the way down his leg. I shall try setting it up the way you suggest with lung on the opposite arm.
The one that for no particular reason, that I'd like to be able to get, is the GB 13/14/15 with a twisting palm. Some people can get that one every time. I've only gotten it a few times.Some people call it the televangelist KO. It has limited fight value but it looks cool. I'll listen to whatever suggestions you have to get that one correctly.
The older I get, the better I was!