@Keilan: After verification with a developer from PI Web Parts, there is no other known way to launch in a PI ProcessBook instance. Wouldn't be easier to block the edition of the *.svg display via SharePoint document permissions?
Can you describe how you have deactivated this option "Launch in Processbook"?
Thanks for confirming Mathieu.
The launch option is deactivated as the sharepoint is locked down so the options button is not available to end users.