I'm almost positive t00l stole the idea from me...
Would it really be that hard?
Simply seems to me you'd need 2 RM's
For the first X days (using my above example) Krueg would lead the Lyrans, then his pilots would have access to Klingon accounts
The Alliance RM would simply start wikt Kzin accoutns, then add Hydran and finally Fed.
The benefit (in my mind) would be to combine GW's racial enemies along with the progressive rise in the level of tech the Empires have
We've complained when we've had to reshuffle YFA's to fix classes that weren't "historcially" involved in the GW at the time, this would help (I think) fix that.
You'd also have to tie intervention of different empires to hex flipping as well, despite what Chuut may claim, it's kinda obvious that any early era server is going to have Kzin outflipping Lyrans by a wide margin- so simply have rules that show if the Kzin (for example) advance X amount into Lyran space, then the Klingon Empire activates earlier.