OK, I haven't been overwhelmed with responses either way here, so decided to go ahead and make it.
I have completed a plugin which calculates the cost by product as described above & stores it, at the same time as increasing the inventory levels.
I haven't got the reporting sorted yet, but am working on it at the moment, how hard can it be
If anyone is interested in this functionality, let me know and I will send you something you can use. If I don't get back to you via the forum, feel free to contact me via my one of my stores.
Cheers
Pat
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