I've been planning to make my ACSM Input plugin compatible with Python 2, too, which should make it work in older Calibre versions. I have only tested that in Calibre 4 so far, and it's still not complete, but if you run into more issues with Calibre 5 during your testing and you have to stay on Calibre 3, you could also wait until I get my plugin updated for Python 2 and see if that works.
I haven't had that much time for my plugin in the last weeks, but I'll take a look again soon-ish and see if I can finally get the Python 2 version ready.
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