quick time movie file size

Yes, you can downres it for the web. That is not what ProRes is for! Use mpeg4 to do that.

As for how to deliver to your clients, there are lots of possibilities. If it was shot in AVC-I, why not give it to them that way if they have that capability. Or ask them how they would like it delivered.

HD is 10 years early, if you and your clients are not ready to step up to the realities of what it requires. Dealing with ProRes is hardly different than dealing with uncompressed SD. And that workflow has been around over 10 years. So in professional circles, moving HD files around is nothing different.
 
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