Have you considered simply eating the -2 or -3 to-hit you'd get from not getting Weapon Finesse? You're going to want at least 13 Strength for Power Attacking with that two-hander (you can start with 12 as a Gray Elf easily enough), and you won't be able to afford much more than a 16 Dex if you still want solid Int, even with the +2 racial bonus.
As for Unseen Seer, I really see that as only being an option if you're going for a Rogue-styled Gish, not for an agile fighter. All those ranks in Search cross-class are brutal when working with the 2+int Wizard.
Even though you're probably going to top out at 7th- or 8th-level spells, Swiftblades get two distinct advantages over full-casters:
1) Two standard actions per round.
2) 50% un-dispellable miss chance with all attacks and targeted spells.
The pre-reqs also mesh nicely with Elusive Target, which makes it forgivable to just ignore your AC since the typical advantage, forcing opponents to Power Attack for less, is rendered moot.
As such, while a Swiftblade wouldn't be an optimal GOD Wizard, it can certainly act in that capacity if there's not something better around.