BrockenSockets, I stand corrected, so thanks for this challenge, I have one of these stacked lnbs in my garage and thought it was obsolete.
Everything I told you earlier was true, but just not for this stacked lnb. And what you said another poster said about 13v is true.So I think I understand it now, but the right lnb (A or B) is important so try using 13 volts 0khz for lnb A or 107.3 W, and 13 volts 22khz for lnb or 111.1 W on your multi switch then run two lines from the switch to your receiver, It may still require a new vcode but I think this is the right way. The new switch gets connected directly to the lnb so remove the other splitter and 22khz switch.
I'm sure there is also a way to have a single line feed a Dual tuner with this type of LNB, but I'll leave that for a rainy day.
The easiest way I think would be a new lnb but not the challenge. Good luck.
If Life is a Highway,...then why is there no end to this dirtroad?