There is a long winded way, but it can be tricky.
If your project is a .capx, then unzip to a folder. This would give you all the project files.
The .caproj file lists all the plugins that the project uses, so you should be able to get the plugin Id from there. You could then try to make a dummy plugin using it.
Alternatively, you could try hacking all references from the .caproj and xml files in the Layout and Event sheets folders.
Either way - not overly easy.