Heck we can even do a alternative history of this althis, some major turning points that could have gone differently IMHO
IMHO the thing that REALLY went wrong for Federate enemies - or, at least, for France - was that Kal'thzar decided to break with the traditional French strategy. Instead of just rolling over the land (where he could've finished off the HRE once and for all, after the Swedish invasion begun) and THEN making a serious bid for the control of the sea, he went for a risky invasion that, if succesful, could give him an instant win. But the way it turned out, he antagonized his allies (Sweden and Poland), lost his fleet and then was crushed altogether.
Had I been playing France, I would've crushed HRE and then attacked FK in coordination with Sweden and maybe Persia. Not sure if France could've beaten FK completely, IMHO its unlikely, but France certainly could've gained a more-or-less favorable peace.
Or how about this - instead of crazy South American military adventurism, Portugal could've helped France take out FK, in 1863 (when the Gaels were still fighting). Sweden could've helped as well, instead of invading HRE. IMHO that was the time when FK could've been destroyed. But its enemies failed to coordinate their efforts, and missed their golden opportunity...
But but there is no revolvers in the ancient age.....
If it IS ITNES I, then... well, maybe not revolvers, but something NOT completely different from them.
EDIT:
Trust me, my people hate the FK more than they dislike Persia.
Maybe Tasan Kemal does, but the people... are of a contrary opinion.