If you compute the number of hours to offset two years, then it will work just fine.
It would be a positive GMT offset, and remember to subtract 7 hours (or whatever your timezone offset is).
So:
24*365*2 (years) = number of hours in 2 years (supposing it was exactly 2 years off) = 17520 hours
then subtract 7 = 17513:00:00
Of course pictures won't be in the right place unless you rode at the EXACT same speed as the ride that you took the pics on.
If you check out the new beta there have been significant changes to photofusion, making it so you can just add pictures manually.