HD to SD PAL downconversion

Hi!
We've got a DVCPRO HD 720p25 master sequence. The goal is to downscale it to 720x576 anamorphic video for DigiBeta output with the most quality available.
As I understand we are to render it, for example, to ProRes HQ, load it into Shake, downscale and export to an Uncompressed 4:2:2. Is it the best method or you know better taking in count that it's not a time-critical task, quality is more important? And what scale method would you recommend to use in the Transform node in Shake?
Thank you in advance!

I think the workflow you have posted is the best you can do in software.
Jerry

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