I'd imagine, when TES5Edit is available, you could filter for those objects in the plugin, select them all, change one REFR's property flags, then "Copy to selected" the whole script subrecord. Of course that does you no good right now, but TES5Edit is coming. Might be worth it to just wait. Then again, if you edit the NIFs you'd have not need the overrides to the REFRs unless replacing STAT REFRs with MSTTs. Are these items to be grabable? If so, you could go as far as to make them MISC forms instead and give them values/names/weights/etc.
Search/Replace from within the Render window will retain the items' positions, BTW

Sorry if I'm rambling.