Exported my Canon 5 mk ii footage in the wrong format in Final Cut

Hi,

So i'm making a short film shot on my Canon 5D mk ii at 30fps. I made the mistake of not converting the clips and I chose the setting "Apple Intermediate Codec" in Easy Set Up without knowing what that actually meant.

I finished editing the film, and I tried to export it with the default settings. The quality looked terrible, and I went I tried to play it back on a different computer it would say "converting" and that it cannot be played. Then I tried to export it as prores 422 1920x1080 30fps. I was able to create a decent copy that works, however I cannot put the video in my usb/disk and try it out on diffrent computers because its 10 GB.

I need to present my film in my class and 1)The file is too big and 2) I dont know if it will play back in different computers. I know that I should have converted my clips at the beginning into a more manageable format, but its too late now.

Is there any other export setting I can try to make it a decent quality and about half the size? I know that I should have not chosen "Apple intermediate Codec" at the beginning. Is there a way to convert all the clips in my movie without starting from the beginning?

Any help is appreciated!