Stephen, when i first read your post i wasnt on board.. however i reread it, thought about it a bit and I think I like what you said.
Still, i dont understand the difference between real IOIs and IOIs used to inspire jealousy. I would say they are almost one and the same... maybe i just dont want to admit I am just a tool being used to inspire jealousy. Either way, this seems to be the least important part of your post.
let me try to recap your advice (as i tried to recap, i noticed i wasnt entirely sure how to accomplish what you said) working with the party as it was detailed in my original post:
1. create a conversation with both GFs. make sure you position yourself so other girls / targets can see you and maybe even hear bits of your convo
2. bore the two GFs with conversation [suggestions on how to bore them without having them walk away? work talk? - i've been working so hard to be more entertaining, seems almost more difficult now to come across as boring

]
3. When you sense they are saturated with boredom (lots of IODs) get a target girl into the conversation.
4. Turn it on, mainly focus on creating more attraction / comfort (no need to open cause we all, for the most part, 'know' who each other are in some sort of manner
5. Once you sense IOIs coming in from GF call the BFs into the scene and ego boost them (this is DHV to main target girl as she sees you be 'loved' by everyone)
6. restructure the group sitting position, easier if standing, so BF/GFs are together and you are with main target girl (this might actually have a subconscious effect on the girl - she is being visually bombarded by images of two happy couples and she has no one :'( oh wait, I'M here for her

[maybe? thoughts?].
7. break her away from the group and take her to another room "for a drink" or because it was a welcoming party "to check out other parts of the house"
wow.. at first i wasnt sure what you were saying, but i think you nailed it on the head. This, when written out (huge difference between writing and reality though) seems like it would often see a high margin of success!
Thanks for the reply man!