I have the same setup. 2.40 mt antenna with 99-101-103, now I'm working on add 119 to my HR23.
I already have a 1.80 mt pointed to 119, the question is how to conect to the Zinwell switch....
Curiosity, Why do you want to add 119 ?
Anyway I have a DTVAHKAKUKIT which has a entrance for 119 on the side. Never tried whether it will work or not but could be a possiblity so u do not have to worry about joining with a multswitch or additional combiners....You can use one of these instead of any of LNBs you have on your 2.4 dish.
Let us know if you are successful.
I am in process of joining 95W but that will work by putting it directly on Flex Port 1.
Good Luck