Better decoders in Premiere Pro / Sony Vegas? ( Colorspace issues )

[Incendia]

Is there any way to make Sony Vegas and/or Adobe Premiere use alternate decoders for certain filetypes?

I'm trying to archive some UTCodec YUV422 (ULY2) files as H264 High 4:2:2 using x264, but Vegas refuses to read the video ( Instead showing a green frame ), while Premiere Pro seems to offset color channels or something
( See : http://imgur.com/a/su1EJ ).

I'm primarily a Vegas user, but can convert to premiere if it's the only application that can be "fixed". Currently it looks like neither's decoder support the High 4:2:2 spec, even though Mainconcept's decoder is supposed to ( I know that's what Premiere uses, I'm not entirely sure about Vegas )

4:2:0 works fine in both, but damages color too much for archiving.

ref: Sony Vegas Pro 11, Premiere Pro CS5