Well, I for one would be interested to see what you've come up with (along with your methodology).
My methodology was based on knowing the names of three of the Hidden Worlds/Systems; Jardine/Herakleion, Odessa/Gabriel and Tangerez/Mayadi.
I printed off the full 2750 Inner Sphere map from the PDF of ER2750 and located these three systems. Drawing straight lines between the three known worlds, I noted that it was ~290 LY from Jardine to Odessa, and another ~290 LY from Odessa to Tangerez. From that I took the wild mass guessing of saying that Tagerez to "Taussen" was another ~290 LY, that Jardine to "Obedeah" is also ~290 LY and that finally, "Taussen" to "Obedeah" is also ~290 LY
From there using a pencil, compass and a lot of sweat, I came up with a clump of potential worlds in each state that they could be. I eliminated a few based on names and when they vanished to get a shortlist.
(Blacknova did more or less the same thing at the same time to get the same results, but he punted his out as a document rather then my scribbling notes on the back my hand)
By my guess, "Taussen" could be Korvitz or Maison, both worlds that died in the first SW (ie, about the same time as Jardine and Tangerez.) or possibly Lynchburg or Quimper, though those two are 3rd SW casualties.
"Obedeah" could be Bhykov, Runrig or Tunlmar, all of which died in the 1st or 2nd SW. There's also Sharpe which was a 3rd SW loss and again likely too late. Interestingly, this would mean that it was inside the CC throughout.
Or I am entirely wrong and being laughed at.