Can this be done? Granted it is only applicable to Vascular Plants, but that could be made clear in the display in the window below. I expect this would result in very few hemihomonyms intended for other kingdoms, and would cut way down on outdated plant names coming in that need to be resolved with POWO by curators.
If curators want to “take on” a node of vascular plants (like a family), Scott can mass import the missing names in that family from POWO. Then synonyms existing on iNat can be swapped into the new names. I did this for Hypericaceae for example and would be happy to answer questions if people want to send me messages.