what if I wanted to remove/delete/kill an entity already at a monument, say the workbenches at outpost?

That's not currently in scope for the plugin, as the plugin is focused on adding things to monuments, not removing things. However, it has crossed my mind that when people are customizing monuments, they might want to remove things already present.

The way I would implement this, off the top of my head, is that I would create a new command: makillvanilla. Running that command while aiming at a monument entity would kill it and save information about it into a data file (possibly save it into a profile). The data would include prefab, position, rotation, and maybe some other properties needed to respawn it. Upon loading the plugin, it would check the saved coordinates for a matching entity, and remove it if present. Upon unloading the plugin, removed entities would be respawned. I would make sure it also applies the same kill/respawn effect to any duplicates of the monument.

If I were to implement this, it would be fairly low priority. I'm working on a long list of features for the plugin at the moment, so this would have to wait possibly a few months. If you want this feature sooner, I could possibly be commissioned for $$$ to implement a standalone plugin that simply kills the entities without saving their data, which would not respawn them on plugin unload.

No worries, and thanks, maybe I was just over looking something. I'm sure it would be a niche feature anyway. My idea was removing the level 1 workbenches and putting 2 for example.