Iterative Photoshop Editing is possible

Question

Dunno if someone has already posted this, if so, my apologies -- I missed it if it has. Anyway, I won't rehash the iterative photoshop woes except to say that the big problem facing photoshop developers is having progressive edits on consecutive PSD versions, because if you duplicate the PSD, when opened in PS, it is flattened. Here's the workaround, very similar to Ian Wood's earlier solution to get around the RAW conversion problem, except that you do not have to leave Aperture/PS to do it, and no imports are required:
The assumption is that you've imported a RAW, and edited in Photoshop (PS)(adding layers), which creates a "PSD master" in Aperture (AP), which retains the layers. To get a duplicated version of this PSD with layers:
1) Duplicate the PSD in AP.
2) Open the duplicate in an external editor (PS) (it will be flattened).
3) Open the original PSD in AP in PS.
4) Copy all layers from the original PSD to the duplicate PSD.
5) Save the duplicate PSD.
Now in Aperture, you will have two identical PSD masters, which are layered, and can be edited. If you export either one of these using "Export Master" you will get a PSD file which retains layers. Also in AP, you will have an extra version (the original dup) that you can delete.
I have an action which performs all the steps above in PS, so effectively all you have to do is open the two files and run the action and your new layered version is created. I ran into one snafu with it though. When recording a PS action, when you drag layers from one document to another, the action doesn't record the copy, just the selection of the next document. If anyone knows the way around this let me know, and I'll fix that action and post it. Otherwise, the present action goes up to the point where all you have to do is drag/drop the already selected layers to complete the copy.
What this showed me is this: smoothing this out is likely completely trivial. Apple should be able to do this fairly easily. As soon as Aperture saw the layered PSD, it seemed to view it as a new file and display it, because the result of this process was not just one new file, but two.
If anyone knows the answer of how to record the copying of layers from one document to another in actions (when you don't know how many layers you are actually dealing with), let me know.
Brad
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Answer 1

I probably should also have added for those that haven't followed this problem from the get-go is that the thing that is key about this is that all edited versions of PSDs will sit inside the Aperture library, and are able to be managed/stored from within Aperture's facilities. One real key problem that the duplicate version flattening presented was that as soon as one resorted to exporting to address the problem, file management was now split into two places -- Aperture, and whatever external mechanism that was being used.
This way, management can take place entirely from within Aperture, and files are locked up -- export master on a layered PSD will export the layered PSD correctly.
If someone has already been here already, sorry -- I'm late to the party...and I'm happy to join you.
Brad