If one were to search for the name of this plugin and "github" with one's favourite search engine, one might find a place where one could fetch the current plugin repository and build a release that works[*] with Calibre 5 and python3.
Sure it's not drop in, but if one was familar with a command line one should be able to have one's cake and eat it too.
[*] Only tested with Amazon purchases, haven't bought anything epub lately.
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