Swapping low res for high res footage in iMovie 11?

I have been using iMovie HD and 11 for a while now and somehow I missed the whole "convert your footage before you edit" train. I have edited several videos, all of which I was importing and editing the GoPro footage without converting it to Apple Prores like I learned I should be doing. So, obviously, I have learned the error of my ways and I am now converting all my footage prior to editing.
Is there any way to save all my old videos? Is there a way to do a one to one swap of all the footage? I vaguely remember reading on a forum that someone was editing in a compressed format and then prior to exporting somehow swapping all the footage to save time on the front end and to spare his computer and iMovie the trouble of using those huge files.
Is this ringing a bell with anyone?
Any help would be appreciated.
Cheers

To my knowledge, imovie 6 will not do this.
iMovie 11 will allow you to select an h.264 file (or Event) and optimize it to Apple Intermediate Codec. If you do it this way, your project will be intact, and your h.264 clips will go to the Movies/iMovie Original Movies folder.
iMovie 11 will only be able to use ProRes 422 if you have Final Cut Pro installed on the same Mac. iMovie will not automatically optimize to ProRes 422.
Final Cut Pro will allow a lot of flexibility in swapping media. You can edit in Pro Res Lite and then switch to Full Pro Res when you are ready to make the final movie, for example.

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