I have an OBJ file for my original prop, and I also have separate OBJ files for each morph target.

I now want to create a PP2 file that includes all the morph target data (I'm reasonably familiar with the PP2 file format).

My current method of creating the deltas (don't laugh!) is to import the OBJs into a spreadsheet, write simple formulae (A minus B) to convert the absolute coordinates of the morph targets to deltas, and then cut-and-paste these deltas into the targetGeom deltas in the PP2. (Yes, I like doing things the hard way!)

Now there MUST be a more sensible way!
Advice please

*I know that I can import the original OBJ in Poser6, and then load the other OBJs as morph targets, but I can only save this as a PZ3/PMD pair.  
Yes, I can then extract the necessaries from the PZ3 to make a PP2, but the deltas are still hidden away in binary form in the PMD, which is not what I want .  
(I also want the PP2 to work with DAZ|Studio, which doesn't seem to understand PMDs)*

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The 3Dcheapskate* occasionally posts sensible stuff. Usually by accident.
And it usually uses Poser 11, with units set to inches. Except when it's using Poser 6 or PP2014, or when its units are set to PNU.

*also available in ShareCG, DAZ, and HiveWire3D flavours (the DeviantArt and CGBytes flavour have been discontinued).