I am happy to help any plugin developer convert their existing plugins from python 2.7 only to code that will work with both python 2.7 and python 3 at the same time.
Also, I am unsure what you mean by "sigil-python3.exe can't run alone". On Mac OSX the embedded python can certainly run alone and on Windows you should be able to use it to run your plugins as well. There will in fact be a new checkbox in Preferences for it.
So please explain what isn't working to use the embedded python to run plugins.
Thanks,
KevinH
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