Though until then: couldn't you start the relevant line in Extra with a clear label and then use a regex to extract it and leave the rest alone? Or is that what you mean by "remove"?
(That's what we do for things like PMID that we currently add to the Extra field).

I thought I'd chime in on this thread as adding geospatial capabilities to Zotero would be hugely useful for people in the environmental and so many other industries. I've seen two efforts to do this, LiteratureMap is one. Zotero Maps (https://www.zotero.org/blog/zotero-maps-visualize-your-zotero-library-on-the-globe/) is another. Unfortunately, development of the latter seems to have stopped.

LitMap looks promising and the addition of a geospatial field would certainly help keep geodata organized and untangled with other forms of data that might be in the Extras field. On the LitMap end, it would be great to see not only point data handled, but also line and polygon data. Integration with ArcGIS and Google Earth would be incredibly helpful.

For Zotero, further development of Zotero Maps would be great as the incorporation of a map within the Zotero interface would give users a unique way access their bibliographic data, ie on a map rather than a standard list. When you're dealing with lots of documents that have a specific geographic focus, this means of visualizing your library would really streamline your work flow. Another handy feature would be the ability to access your documents through the map interface by way of a pop-up balloon with a hyperlink to the document, so that you could open it by interacting with the map.

Geospatial development would be ideal for people in the sciences and resource management industries, such as biological or archaeological resources, where documentation is often strongly linked to specific geographic areas- such as the territory of a specific animal species under study, or the distribution of archaeological sites within a particular city, state, or region. The same is true of the construction industry, where documentation is typically confined to a specific project area. I'm sure there are many other industries or research fields that would benefit immensely from the ability to visualize a library on a map, to be able to click on a geographic area and see all the documents that pertain to it. For a large number of people this functionality would allow much better access to documents stored in Zotero than the current database style list does.

I definitely hope we see some movement forward in this direction and I appreciate the efforts made so far.

Definitely appreciate your work on this and will do

The API provides pretty easy access to the correct field without having to deal with the complex table relationships for Zotero. We've actually solved the need for an additional field in an upcoming release for Literature Mapper. It will use html-style tags to store the spatial information in the Extra field so it won't overwrite other text there.