Essential Merchants

[Lily]

I'm looking into creating a mod that would refresh merchant inventories every time you return to their planet.

The best way I can see to do this is to go through their inventory, clear it, and then re-run the population script.  My biggest concern with this is clearing out any essential items, quest reward items, etc. that are added to their shop somewhere other than on the initial creation script.  Do we have any kind of comprehensive list of which merchants have extra items added to their shop beyond their initial inventory so I can be sure not to clear them?  Or if anyone has ideas on a better way to do this, I'm open to suggestions.  Thanks for any help.