That Add-In is not quite good for that purpose, as it scans resource files in directory, not in project only.
Maybe sub directories for projects helps.The project cleaning is a problem too or is it?
Project name is repeated as
events Add-In returns projects info from current project only,
so not so useful for a workspace with several projects.
AIE_PRJ_STARTBUILD:
The build of a project or workspace will start. The argument hwnd contains the handle of the project window. [2.90]
EDIT: A dilemma:
With workspaces Add-In don't know where it comes, so it needs individual events for each projects.
Now it have an event only for the current project