Naming ETag files?

I would like to save my --etag-compare and --etag-save (probably the same
name) files with names generated from the --remote-header-name; perhaps
as simple as "$remote-header-name.ETag".  Is there an orderly and reliable
way to do this?

I'm not entirely optimistic because I suspect the if-match may need to be
processed before the is available.

As an alternative, is it possible to use "--write-out %{filename_effective}"
without actually downloading the resource?  I could then use
"$filename_effective.ETag" to name my ETags.

Thanks
-- 
gil
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