Use HemMedia Player
You can easily edit your STACK file at any time using the HemMedia Player to launch it. Once launched, you can Ctrl-click in the upper-left corner of the stack to go into Developer Mode. From there you can press the open Developer button to access the Developer Mode control panel.
From there you can reimport your Hemingway XML ZIP files and do all of the same things you could do when you were using the plugin from within Hemingway.