Figured someone over here might be interested... over the weekend, I built a new right-click menu item plugin for editing set controls and constants. The UI is bad, but it works; if anyone wants to work on the UI, you're welcome to do so. Building a map editor would follow the same pattern as the set editor.
https://forums.ni.com/t5/LabVIEW-Shortcut-Menu-Plug-Ins/Edit-A-Set-Value-llb/ta-p/4020190
pylabview could do it, but it looks like there are differences in "Virtual Instrument Tag Strings" section, and the parser can't read that section ATM:
So - only NI can help you, unless you are willing to help in development of pylabview.