Hello. We will consider this for a future version.
In the meantime one other possible thing that you could do to reduce the manual effort is if you were to use File > Export all grids to single HTML file. This would put everything from all grids into a single file. You could then run a script on that single file to parse it for all of the host names.
One other thing that also might be useful to you is Grid > Synchronize, which can be used to synchronize a grid with an AD OU or Group, which might help in your effort to compare everything.
The notes above are just ideas. Maybe they can help or maybe they won’t work well for your situation, but I wanted to mention them just for you to be aware of in case you hadn’t considered them before.