This is probably due to the fact that Silverstag allows you to change the default names of towns/castles/settlements that you control through thein game 'Gather Information & Recruitment' menu, Morgh's tools might not work because of this as the tools are aimed at Native and not tailored to any specific mods.
The only way I imagine you will be able to do this is by changing the names of the settlements in the python files for Silverstag (they're included in the download) and then building the module once you've edited the relevant .py files.