Maybe demolisher territories could be the “pollution” overlay for Vulcanus, so it could be turned on and off at any time


though yes, if your concern is how it looks.

the problem I find with the demolisher is that once you understand how it works, it really does not have any dynamic gameplay ...

TL;DR on map creation; a button to turn off the visibility of the demolisher territories

there is a more nuanced version where you could make radars see the bounderies partially, and perhaps only through a research. but as a minimally invasive update; a single checkmark to turn off the demolishers ...