I believe as I tried before that you can’t make any changes in the linked model, so as I understood from ur problem that you want to implement the changes on the other models(which are linked), if I were you i will get the linked elements ID’s and save them in excel with changes after that i will make dyn that read the excel and make the changes to elements Parameter(to be run in the other models).
check this topic to know how to read the ID’s of the linked model.