This is a great idea Haldi. Simple & effective.
I will write the formula needed on wiki, for users doing it by hand.
Likely also write a javascript calculator & post on WSGF somehow (future).
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Update: Jan 20, 2016
http://www.wsgf.org/blog/imusrt/2016/01/20/monitormixer-plp-mixed-lll-layout-creation-utilityThe utility has been created. It also uses a spec-database to help find layouts. You can also Match ALL, finding all possible layouts in database. Seems pretty accurate. But time will tell, & I have not tested it thoroughly yet.
Thanks for your simplification-idea Haldi. And your recently pointing me to AutoIT. Good language.