I would have to say no, because becoming venerable does not change the character, merely an randomly determined time (1d12 months) after their transition to venerable.
Since the spell is only a 'temporary' effect, it won't last long enough to trigger the change. If you want any particularly detailed reason as to why this won't work, you'll have to determine how the final change actually works as fluff. Does merely the aging to venerable trigger a countdown? Does the creature have to spend X amount of time as venerable as the final change gradually wears down his ability to fight it off?
So, no. Ask your GM.