What export settings would you use to get a web friendly file, out of a movie with a transparent background?
It's a short animation (2 secs) at 1920x1440 size. I need to export it with rgb+alpha, so I chose the png codec, which output a 44mb sized file.
Is it possible to get it under 10mb somehow?
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The only web-friendly video spec with alpha is FLV. You may need an old copy of Adobe Media Encoder to make it. If I recall correctly, CS5.5 did it correctly while CS6 would double the file size for some reason. I'm not sure if there was a bug fix to CS6 and I've never dealt with it since CC released, so I don't know what versions of it you need.
Adding to Szalam's reply, you can download Premiere Pro CS6 version following the instructions in this article How to Find and Install Previous Version of Adobe Apps in CC 2015 | Adobe Customer Care Team