I never did this but I do think it is possible. you will need to create 2 add in. With runs at start up and one run when user press the button. When the user press the command. Write a script that will write the file name you want to open into a text file and then you trigger start revit. At startup, read the text file and open the revit you list in the text file. Then run command after file is open. This may or may not work but I would approach your problem this way.
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