It Would Work

[Thaliur]

Your script doesn't sound too bad, but Philip never mentioned a fiancé (though this is no reason to believe there is none), and since he's already looking for his father, there is really no need to make it a "rescue the helpless and dependent woman" story.
I have nothing against women in movies, but the same thing happened to The First Men In The Moon, The War Of The Worlds, and - in the remade version - to The Time Machine. I think altering a plot like this takes a lot of the attention away from the actual plot.