Looking at the current state of the PageEdit application and the fact that you guys already spent time and effort to migrate to new QtWebEngine platform making cross-platform epub reader would be in my opinion a natural thing to do.
Key feature here would be a reading progress sync feature across different platforms (Windows, OSx and Unix).
Under Windows there are not that many good epub reader programs. Calibre Viewer simply is not designed as a cross platform standalone application. I see it more like an extension to the Calibre Library Management function. Also Calibre viewer does not have sync function.
So, it does not look as your idea would a duplication effort.
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