In LC version 6 and 7, I could upload some static PDF forms into the Form Manager, put them in some category, without associate them with any workflow process; and users can display them in the browser and save them or print them.
You can't have multiple forms using the same dummy process, because the form being displayed in workspace is going to be the one that has the property set to IN and if you have more than one IN form variable, the first one will be shown or you'll get an error (I'm not sure).
So you'll have to create a dummy process for every static form.
What you can do is create a "master" process, and then a dummy process for each form. The dummy processes each just call the master process, passing the xfaForm variable as a parameter. This works well if you have a common master process that all forms go through, such as an approval process.